3DPrinting/PrusaSlicer-NonPlainar
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Fix of ASCII STL parser. Accept a model even with invalid normals.

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This commit is contained in:
bubnikv 2016-12-05 11:39:17 +01:00
parent 330ffed87e
commit 3e8cafa857
1 changed files with 16 additions and 22 deletions
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38
xs/src/admesh/stlinit.c
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@ -43,23 +43,8 @@ stl_open(stl_file *stl, char *file) {
void
stl_initialize(stl_file *stl) {
stl->error = 0;
stl->stats.degenerate_facets = 0;
stl->stats.edges_fixed = 0;
stl->stats.facets_added = 0;
stl->stats.facets_removed = 0;
stl->stats.facets_reversed = 0;
stl->stats.normals_fixed = 0;
stl->stats.number_of_parts = 0;
stl->stats.original_num_facets = 0;
stl->stats.number_of_facets = 0;
stl->stats.facets_malloced = 0;
memset(stl, 0, sizeof(stl_file));
stl->stats.volume = -1.0;
stl->neighbors_start = NULL;
stl->facet_start = NULL;
stl->v_indices = NULL;
stl->v_shared = NULL;
}
void
@ -270,6 +255,7 @@ stl_read(stl_file *stl, int first_facet, int first) {
rewind(stl->fp);
}
char normal_buf[3][32];
for(i = first_facet; i < stl->stats.number_of_facets; i++) {
if(stl->stats.type == binary)
/* Read a single facet from a binary .STL file */
@ -287,17 +273,25 @@ stl_read(stl_file *stl, int first_facet, int first) {
fscanf(stl->fp, "endsolid\n");
fscanf(stl->fp, "solid%*[^\n]\n"); // name might contain spaces so %*s doesn't work and it also can be empty (just "solid")
if((fscanf(stl->fp, " facet normal %f %f %f\n", &facet.normal.x, &facet.normal.y, &facet.normal.z) + \
fscanf(stl->fp, " outer loop\n") + \
fscanf(stl->fp, " vertex %f %f %f\n", &facet.vertex[0].x, &facet.vertex[0].y, &facet.vertex[0].z) + \
fscanf(stl->fp, " vertex %f %f %f\n", &facet.vertex[1].x, &facet.vertex[1].y, &facet.vertex[1].z) + \
fscanf(stl->fp, " vertex %f %f %f\n", &facet.vertex[2].x, &facet.vertex[2].y, &facet.vertex[2].z) + \
fscanf(stl->fp, " endloop\n") + \
if((fscanf(stl->fp, " facet normal %31s %31s %31s\n", normal_buf[0], normal_buf[1], normal_buf[2]) +
fscanf(stl->fp, " outer loop\n") +
fscanf(stl->fp, " vertex %f %f %f\n", &facet.vertex[0].x, &facet.vertex[0].y, &facet.vertex[0].z) +
fscanf(stl->fp, " vertex %f %f %f\n", &facet.vertex[1].x, &facet.vertex[1].y, &facet.vertex[1].z) +
fscanf(stl->fp, " vertex %f %f %f\n", &facet.vertex[2].x, &facet.vertex[2].y, &facet.vertex[2].z) +
fscanf(stl->fp, " endloop\n") +
fscanf(stl->fp, " endfacet\n")) != 12) {
perror("Something is syntactically very wrong with this ASCII STL!");
stl->error = 1;
return;
}
// The facet normal has been parsed as a single string as to workaround for not a numbers in the normal definition.
if (sscanf(normal_buf[0], "%f", &facet.normal.x) != 1 ||
sscanf(normal_buf[1], "%f", &facet.normal.y) != 1 ||
sscanf(normal_buf[2], "%f", &facet.normal.z) != 1) {
// Normal was mangled. Maybe denormals or "not a number" were stored?
// Just reset the normal and silently ignore it.
memset(&facet.normal, 0, sizeof(facet.normal));
}
}
#if 0