396 lines
12 KiB
C++
396 lines
12 KiB
C++
#include <unordered_set>
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#include <unordered_map>
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#include <random>
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#include "sla_test_utils.hpp"
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namespace {
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const char *const BELOW_PAD_TEST_OBJECTS[] = {
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"20mm_cube.obj",
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"V.obj",
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};
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const char *const AROUND_PAD_TEST_OBJECTS[] = {
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"20mm_cube.obj",
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"V.obj",
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"frog_legs.obj",
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"cube_with_concave_hole_enlarged.obj",
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};
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const char *const SUPPORT_TEST_MODELS[] = {
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"cube_with_concave_hole_enlarged_standing.obj",
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"A_upsidedown.obj",
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"extruder_idler.obj"
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};
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} // namespace
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// Test pair hash for 'nums' random number pairs.
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template <class I, class II> void test_pairhash()
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{
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const constexpr size_t nums = 1000;
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I A[nums] = {0}, B[nums] = {0};
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std::unordered_set<I> CH;
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std::unordered_map<II, std::pair<I, I>> ints;
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std::random_device rd;
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std::mt19937 gen(rd());
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const I Ibits = int(sizeof(I) * CHAR_BIT);
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const II IIbits = int(sizeof(II) * CHAR_BIT);
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int bits = IIbits / 2 < Ibits ? Ibits / 2 : Ibits;
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if (std::is_signed<I>::value) bits -= 1;
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const I Imin = 0;
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const I Imax = I(std::pow(2., bits) - 1);
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std::uniform_int_distribution<I> dis(Imin, Imax);
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for (size_t i = 0; i < nums;) {
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I a = dis(gen);
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if (CH.find(a) == CH.end()) { CH.insert(a); A[i] = a; ++i; }
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}
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for (size_t i = 0; i < nums;) {
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I b = dis(gen);
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if (CH.find(b) == CH.end()) { CH.insert(b); B[i] = b; ++i; }
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}
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for (size_t i = 0; i < nums; ++i) {
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I a = A[i], b = B[i];
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REQUIRE(a != b);
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II hash_ab = sla::pairhash<I, II>(a, b);
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II hash_ba = sla::pairhash<I, II>(b, a);
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REQUIRE(hash_ab == hash_ba);
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auto it = ints.find(hash_ab);
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if (it != ints.end()) {
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REQUIRE((
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(it->second.first == a && it->second.second == b) ||
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(it->second.first == b && it->second.second == a)
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));
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} else
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ints[hash_ab] = std::make_pair(a, b);
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}
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}
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TEST_CASE("Pillar pairhash should be unique", "[SLASupportGeneration]") {
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test_pairhash<int, int>();
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test_pairhash<int, long>();
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test_pairhash<unsigned, unsigned>();
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test_pairhash<unsigned, unsigned long>();
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}
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TEST_CASE("Support point generator should be deterministic if seeded",
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"[SLASupportGeneration], [SLAPointGen]") {
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TriangleMesh mesh = load_model("A_upsidedown.obj");
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sla::EigenMesh3D emesh{mesh};
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sla::SupportConfig supportcfg;
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sla::SupportPointGenerator::Config autogencfg;
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autogencfg.head_diameter = float(2 * supportcfg.head_front_radius_mm);
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sla::SupportPointGenerator point_gen{emesh, autogencfg, [] {}, [](int) {}};
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TriangleMeshSlicer slicer{&mesh};
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auto bb = mesh.bounding_box();
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double zmin = bb.min.z();
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double zmax = bb.max.z();
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double gnd = zmin - supportcfg.object_elevation_mm;
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auto layer_h = 0.05f;
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auto slicegrid = grid(float(gnd), float(zmax), layer_h);
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std::vector<ExPolygons> slices;
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slicer.slice(slicegrid, CLOSING_RADIUS, &slices, []{});
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point_gen.seed(0);
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point_gen.execute(slices, slicegrid);
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auto get_chksum = [](const std::vector<sla::SupportPoint> &pts){
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long long chksum = 0;
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for (auto &pt : pts) {
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auto p = scaled(pt.pos);
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chksum += p.x() + p.y() + p.z();
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}
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return chksum;
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};
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long long checksum = get_chksum(point_gen.output());
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size_t ptnum = point_gen.output().size();
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REQUIRE(point_gen.output().size() > 0);
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for (int i = 0; i < 20; ++i) {
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point_gen.output().clear();
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point_gen.seed(0);
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point_gen.execute(slices, slicegrid);
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REQUIRE(point_gen.output().size() == ptnum);
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REQUIRE(checksum == get_chksum(point_gen.output()));
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}
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}
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TEST_CASE("Flat pad geometry is valid", "[SLASupportGeneration]") {
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sla::PadConfig padcfg;
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// Disable wings
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padcfg.wall_height_mm = .0;
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for (auto &fname : BELOW_PAD_TEST_OBJECTS) test_pad(fname, padcfg);
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}
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TEST_CASE("WingedPadGeometryIsValid", "[SLASupportGeneration]") {
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sla::PadConfig padcfg;
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// Add some wings to the pad to test the cavity
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padcfg.wall_height_mm = 1.;
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for (auto &fname : BELOW_PAD_TEST_OBJECTS) test_pad(fname, padcfg);
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}
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TEST_CASE("FlatPadAroundObjectIsValid", "[SLASupportGeneration]") {
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sla::PadConfig padcfg;
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// Add some wings to the pad to test the cavity
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padcfg.wall_height_mm = 0.;
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// padcfg.embed_object.stick_stride_mm = 0.;
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padcfg.embed_object.enabled = true;
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padcfg.embed_object.everywhere = true;
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for (auto &fname : AROUND_PAD_TEST_OBJECTS) test_pad(fname, padcfg);
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}
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TEST_CASE("WingedPadAroundObjectIsValid", "[SLASupportGeneration]") {
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sla::PadConfig padcfg;
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// Add some wings to the pad to test the cavity
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padcfg.wall_height_mm = 1.;
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padcfg.embed_object.enabled = true;
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padcfg.embed_object.everywhere = true;
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for (auto &fname : AROUND_PAD_TEST_OBJECTS) test_pad(fname, padcfg);
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}
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TEST_CASE("ElevatedSupportGeometryIsValid", "[SLASupportGeneration]") {
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sla::SupportConfig supportcfg;
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supportcfg.object_elevation_mm = 5.;
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for (auto fname : SUPPORT_TEST_MODELS) test_supports(fname);
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}
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TEST_CASE("FloorSupportGeometryIsValid", "[SLASupportGeneration]") {
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sla::SupportConfig supportcfg;
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supportcfg.object_elevation_mm = 0;
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for (auto &fname: SUPPORT_TEST_MODELS) test_supports(fname, supportcfg);
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}
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TEST_CASE("ElevatedSupportsDoNotPierceModel", "[SLASupportGeneration]") {
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sla::SupportConfig supportcfg;
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for (auto fname : SUPPORT_TEST_MODELS)
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test_support_model_collision(fname, supportcfg);
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}
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TEST_CASE("FloorSupportsDoNotPierceModel", "[SLASupportGeneration]") {
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sla::SupportConfig supportcfg;
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supportcfg.object_elevation_mm = 0;
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for (auto fname : SUPPORT_TEST_MODELS)
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test_support_model_collision(fname, supportcfg);
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}
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TEST_CASE("DefaultRasterShouldBeEmpty", "[SLARasterOutput]") {
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sla::Raster raster;
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REQUIRE(raster.empty());
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}
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TEST_CASE("InitializedRasterShouldBeNONEmpty", "[SLARasterOutput]") {
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// Default Prusa SL1 display parameters
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sla::Raster::Resolution res{2560, 1440};
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sla::Raster::PixelDim pixdim{120. / res.width_px, 68. / res.height_px};
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sla::Raster raster;
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raster.reset(res, pixdim);
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REQUIRE_FALSE(raster.empty());
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REQUIRE(raster.resolution().width_px == res.width_px);
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REQUIRE(raster.resolution().height_px == res.height_px);
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REQUIRE(raster.pixel_dimensions().w_mm == Approx(pixdim.w_mm));
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REQUIRE(raster.pixel_dimensions().h_mm == Approx(pixdim.h_mm));
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}
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using TPixel = uint8_t;
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static constexpr const TPixel FullWhite = 255;
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static constexpr const TPixel FullBlack = 0;
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template <class A, int N> constexpr int arraysize(const A (&)[N]) { return N; }
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static void check_raster_transformations(sla::Raster::Orientation o,
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sla::Raster::TMirroring mirroring)
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{
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double disp_w = 120., disp_h = 68.;
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sla::Raster::Resolution res{2560, 1440};
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sla::Raster::PixelDim pixdim{disp_w / res.width_px, disp_h / res.height_px};
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auto bb = BoundingBox({0, 0}, {scaled(disp_w), scaled(disp_h)});
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sla::Raster::Trafo trafo{o, mirroring};
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trafo.origin_x = bb.center().x();
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trafo.origin_y = bb.center().y();
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sla::Raster raster{res, pixdim, trafo};
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// create box of size 32x32 pixels (not 1x1 to avoid antialiasing errors)
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coord_t pw = 32 * coord_t(std::ceil(scaled<double>(pixdim.w_mm)));
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coord_t ph = 32 * coord_t(std::ceil(scaled<double>(pixdim.h_mm)));
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ExPolygon box;
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box.contour.points = {{-pw, -ph}, {pw, -ph}, {pw, ph}, {-pw, ph}};
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double tr_x = scaled<double>(20.), tr_y = tr_x;
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box.translate(tr_x, tr_y);
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ExPolygon expected_box = box;
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// Now calculate the position of the translated box according to output
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// trafo.
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if (o == sla::Raster::Orientation::roPortrait) expected_box.rotate(PI / 2.);
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if (mirroring[X])
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for (auto &p : expected_box.contour.points) p.x() = -p.x();
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if (mirroring[Y])
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for (auto &p : expected_box.contour.points) p.y() = -p.y();
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raster.draw(box);
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Point expected_coords = expected_box.contour.bounding_box().center();
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double rx = unscaled(expected_coords.x() + bb.center().x()) / pixdim.w_mm;
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double ry = unscaled(expected_coords.y() + bb.center().y()) / pixdim.h_mm;
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auto w = size_t(std::floor(rx));
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auto h = res.height_px - size_t(std::floor(ry));
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REQUIRE((w < res.width_px && h < res.height_px));
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auto px = raster.read_pixel(w, h);
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if (px != FullWhite) {
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sla::PNGImage img;
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std::fstream outf("out.png", std::ios::out);
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outf << img.serialize(raster);
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}
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REQUIRE(px == FullWhite);
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}
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TEST_CASE("MirroringShouldBeCorrect", "[SLARasterOutput]") {
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sla::Raster::TMirroring mirrorings[] = {sla::Raster::NoMirror,
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sla::Raster::MirrorX,
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sla::Raster::MirrorY,
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sla::Raster::MirrorXY};
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sla::Raster::Orientation orientations[] = {sla::Raster::roLandscape,
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sla::Raster::roPortrait};
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for (auto orientation : orientations)
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for (auto &mirror : mirrorings)
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check_raster_transformations(orientation, mirror);
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}
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static ExPolygon square_with_hole(double v)
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{
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ExPolygon poly;
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coord_t V = scaled(v / 2.);
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poly.contour.points = {{-V, -V}, {V, -V}, {V, V}, {-V, V}};
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poly.holes.emplace_back();
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V = V / 2;
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poly.holes.front().points = {{-V, V}, {V, V}, {V, -V}, {-V, -V}};
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return poly;
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}
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static double pixel_area(TPixel px, const sla::Raster::PixelDim &pxdim)
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{
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return (pxdim.h_mm * pxdim.w_mm) * px * 1. / (FullWhite - FullBlack);
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}
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static double raster_white_area(const sla::Raster &raster)
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{
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if (raster.empty()) return std::nan("");
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auto res = raster.resolution();
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double a = 0;
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for (size_t x = 0; x < res.width_px; ++x)
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for (size_t y = 0; y < res.height_px; ++y) {
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auto px = raster.read_pixel(x, y);
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a += pixel_area(px, raster.pixel_dimensions());
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}
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return a;
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}
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static double predict_error(const ExPolygon &p, const sla::Raster::PixelDim &pd)
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{
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auto lines = p.lines();
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double pix_err = pixel_area(FullWhite, pd) / 2.;
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// Worst case is when a line is parallel to the shorter axis of one pixel,
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// when the line will be composed of the max number of pixels
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double pix_l = std::min(pd.h_mm, pd.w_mm);
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double error = 0.;
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for (auto &l : lines)
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error += (unscaled(l.length()) / pix_l) * pix_err;
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return error;
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}
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TEST_CASE("RasterizedPolygonAreaShouldMatch", "[SLARasterOutput]") {
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double disp_w = 120., disp_h = 68.;
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sla::Raster::Resolution res{2560, 1440};
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sla::Raster::PixelDim pixdim{disp_w / res.width_px, disp_h / res.height_px};
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sla::Raster raster{res, pixdim};
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auto bb = BoundingBox({0, 0}, {scaled(disp_w), scaled(disp_h)});
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ExPolygon poly = square_with_hole(10.);
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poly.translate(bb.center().x(), bb.center().y());
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raster.draw(poly);
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double a = poly.area() / (scaled<double>(1.) * scaled(1.));
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double ra = raster_white_area(raster);
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double diff = std::abs(a - ra);
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REQUIRE(diff <= predict_error(poly, pixdim));
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raster.clear();
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poly = square_with_hole(60.);
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poly.translate(bb.center().x(), bb.center().y());
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raster.draw(poly);
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a = poly.area() / (scaled<double>(1.) * scaled(1.));
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ra = raster_white_area(raster);
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diff = std::abs(a - ra);
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REQUIRE(diff <= predict_error(poly, pixdim));
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}
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TEST_CASE("Triangle mesh conversions should be correct", "[SLAConversions]")
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{
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sla::Contour3D cntr;
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{
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std::fstream infile{"extruder_idler_quads.obj", std::ios::in};
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cntr.from_obj(infile);
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}
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}
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