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#include <sys/stat.h> |
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#include <sys/mman.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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struct xyz |
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{ |
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float x, y, z; |
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}; |
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struct uv |
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{ |
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float u, v; |
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}; |
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struct triangle |
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{ |
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unsigned short a, b, c; |
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}; |
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struct source |
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{ |
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int number_of_verts; |
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struct xyz *xyz_coords; |
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struct uv *uv_coords; |
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}; |
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struct material |
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{ |
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int number_of_tris; |
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int source_index; |
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struct triangle *tris; |
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}; |
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struct model |
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{ |
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int bucket_levels; |
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int number_of_sources; |
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int number_of_materials; |
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struct source *sources; |
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struct material *materials; |
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}; |
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int open_n3m (struct model *m, void *data) |
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{ |
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char *magic = (char*)data; |
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printf("magic: %c%c%c\n", magic[0], magic[1], magic[2]); |
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if (magic[0] != 'N' || magic[1] != '3' || magic[2] != 'M') { |
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return -1; |
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} |
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char version = magic[3]; |
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printf("version: %c\n", version); |
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int *header = (int*)data; |
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m->number_of_sources = header[1]; |
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m->number_of_materials = header[2]; |
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printf("number_of_sources: %d\n", m->number_of_sources); |
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printf("number_of_materials: %d\n", m->number_of_materials); |
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m->sources = calloc(m->number_of_sources, sizeof(struct source)); |
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m->materials = calloc(m->number_of_materials, sizeof(struct material)); |
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int i = 0; |
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for (i = 0; i < m->number_of_sources; i++) { |
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struct source *s = &m->sources[i]; |
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int offset = i * 2 + 3; |
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int data_offset = header[offset]; |
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s->number_of_verts = header[offset + 1]; |
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printf("data_offset: %d\n", data_offset); |
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printf("source[%d].number_of_verts: %d\n", i, s->number_of_verts); |
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s->xyz_coords = (struct xyz*)((char*)data + data_offset); |
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s->uv_coords = (struct uv*)((char*)data + data_offset + s->number_of_verts * 12); |
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} |
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for (i = 0; i < m->number_of_materials; i++) { |
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struct material *mat = &m->materials[i]; |
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int offset = m->number_of_sources * 2 + i * 4 + 3; |
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int indices_offset = header[offset]; |
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mat->number_of_tris = header[offset + 1]; |
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mat->source_index = header[offset + 2]; |
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mat->tris = (struct triangle*)((char*)data + indices_offset); |
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printf("material[%d].number_of_tris: %d\n", i, mat->number_of_tris); |
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printf("material[%d].source_index: %d\n", i, mat->source_index); |
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} |
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return 0; |
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} |
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int save_dae (struct model *m, FILE *f) |
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{ |
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fprintf(f, "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?>\n"); |
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fprintf(f, "<COLLADA xmlns=\"http://www.collada.org/2005/11/COLLADASchema\" version=\"1.4.1\">\n"); |
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fprintf(f, " <asset>\n"); |
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fprintf(f, " <contributor>\n"); |
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fprintf(f, " <authoring_tool>n3mtodae</authoring_tool>\n"); |
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fprintf(f, " </contributor>\n"); |
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fprintf(f, " <created>2012-01-21T04:10:34Z</created>\n"); |
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fprintf(f, " <modified>2012-01-21T04:10:34Z</modified>\n"); |
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fprintf(f, " <unit meter=\"0.0254000\" name=\"inch\" />\n"); |
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fprintf(f, " <up_axis>X_UP</up_axis>\n"); |
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fprintf(f, " </asset>\n"); |
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fprintf(f, " <library_visual_scenes>\n"); |
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fprintf(f, " <visual_scene id=\"ID1VISUALSCENE\">\n"); |
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fprintf(f, " <node name=\"n3mtodae\">\n"); |
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int i = 0; |
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for (i = 0; i < m->number_of_materials; i++) { |
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struct material *mat = &m->materials[i]; |
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fprintf(f, " <instance_geometry url=\"#ID%pGEOMETRY\">\n", mat); |
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fprintf(f, " <bind_material>\n"); |
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fprintf(f, " <technique_common>\n"); |
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fprintf(f, " <instance_material symbol=\"Material2\" target=\"#ID4\">\n"); |
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fprintf(f, " <bind_vertex_input semantic=\"UVSET0\" input_semantic=\"TEXCOORD\" input_set=\"0\" />\n"); |
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fprintf(f, " </instance_material>\n"); |
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fprintf(f, " </technique_common>\n"); |
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fprintf(f, " </bind_material>\n"); |
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fprintf(f, " </instance_geometry>\n"); |
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} |
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fprintf(f, " </node>\n"); |
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fprintf(f, " </visual_scene>\n"); |
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fprintf(f, " </library_visual_scenes>\n"); |
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fprintf(f, " <library_geometries>\n"); |
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for (i = 0; i < m->number_of_materials; i++) { |
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struct material *mat = &m->materials[i]; |
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struct source *src = &m->sources[mat->source_index]; |
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fprintf(f, " <geometry id=\"ID%pGEOMETRY\">\n", mat); |
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fprintf(f, " <mesh>\n"); |
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fprintf(f, " <source id=\"ID%pSOURCE\">\n", src->xyz_coords); |
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fprintf(f, " <float_array id=\"ID%pARRAY\" count=\"%d\">", src->xyz_coords, src->number_of_verts * 3); |
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int j = 0; |
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for (j = 0; j < src->number_of_verts; j++) { |
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fprintf(f, "%g %g %g ", src->xyz_coords[j].x, src->xyz_coords[j].y, src->xyz_coords[j].z); |
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} |
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fprintf(f, "</float_array>\n"); |
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fprintf(f, " <technique_common>\n"); |
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fprintf(f, " <accessor count=\"%d\" source=\"#ID%pARRAY\" stride=\"3\">\n", src->number_of_verts, src->xyz_coords); |
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fprintf(f, " <param name=\"X\" type=\"float\" />\n"); |
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fprintf(f, " <param name=\"Y\" type=\"float\" />\n"); |
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fprintf(f, " <param name=\"Z\" type=\"float\" />\n"); |
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fprintf(f, " </accessor>\n"); |
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fprintf(f, " </technique_common>\n"); |
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fprintf(f, " </source>\n"); |
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fprintf(f, " <vertices id=\"ID%pVERTICES\">\n", mat); |
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fprintf(f, " <input semantic=\"POSITION\" source=\"#ID%pSOURCE\" />\n", src->xyz_coords); |
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fprintf(f, " </vertices>\n"); |
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fprintf(f, " <triangles count=\"%d\" material=\"Material2\">\n", mat->number_of_tris); |
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fprintf(f, " <input offset=\"0\" semantic=\"VERTEX\" source=\"#ID%pVERTICES\" />\n", mat); |
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fprintf(f, " <p>"); |
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for (j = 0; j < mat->number_of_tris; j++) { |
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fprintf(f, "%d %d %d ", mat->tris[j].a, mat->tris[j].b, mat->tris[j].c); |
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} |
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fprintf(f, "</p>\n"); |
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fprintf(f, " </triangles>\n"); |
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fprintf(f, " </mesh>\n"); |
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fprintf(f, " </geometry>\n"); |
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} |
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fprintf(f, " </library_geometries>\n"); |
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fprintf(f, " <library_materials>\n"); |
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fprintf(f, " <material id=\"ID4\" name=\"material\">\n"); |
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fprintf(f, " <instance_effect url=\"#ID3\" />\n"); |
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fprintf(f, " </material>\n"); |
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fprintf(f, " </library_materials>\n"); |
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fprintf(f, " <library_effects>\n"); |
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fprintf(f, " <effect id=\"ID3\">\n"); |
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fprintf(f, " <profile_COMMON>\n"); |
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fprintf(f, " <technique sid=\"COMMON\">\n"); |
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fprintf(f, " <lambert>\n"); |
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fprintf(f, " <diffuse>\n"); |
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fprintf(f, " <color>1.0000000 1.0000000 1.0000000 1.0000000</color>\n"); |
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fprintf(f, " </diffuse>\n"); |
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fprintf(f, " </lambert>\n"); |
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fprintf(f, " </technique>\n"); |
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fprintf(f, " </profile_COMMON>\n"); |
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fprintf(f, " </effect>\n"); |
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fprintf(f, " </library_effects>\n"); |
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fprintf(f, " <scene>\n"); |
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fprintf(f, " <instance_visual_scene url=\"#ID1VISUALSCENE\" />\n"); |
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fprintf(f, " </scene>\n"); |
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fprintf(f, "</COLLADA>\n"); |
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return 0; |
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} |
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int main() |
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{ |
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int fd = open("/Users/fak/Desktop/Nokia3D/b.n3m", O_RDONLY); |
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struct stat sb = {0}; |
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fstat(fd, &sb); |
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void *data = mmap(0, sb.st_size, PROT_READ, MAP_SHARED, fd, 0); |
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struct model m; |
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open_n3m (&m, data); |
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FILE *out = fopen("/Users/fak/Desktop/Nokia3D/b.dae", "w"); |
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save_dae (&m, out); |
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return 0; |
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} |
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praeclarum created this gist