static int
FindMaterialIndex(const RNArray<R3Material *>& materials, const char *name)
{
// Return material with matching name
for (int i = 0; i < materials.NEntries(); i++) {
R3Material *material = materials.Kth(i);
if (!strcmp(name, material->Name())) return i;
}
// No matching material found
return -1;
}
void GLUTRedraw(void)
{
// Set viewing transformation
viewer->Camera().Load();
// Clear window
glClearColor(200.0/255.0, 200.0/255.0, 200.0/255.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Set lights
static GLfloat light0_position[] = { 3.0, 4.0, 5.0, 0.0 };
glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
static GLfloat light1_position[] = { -3.0, -2.0, -3.0, 0.0 };
glLightfv(GL_LIGHT1, GL_POSITION, light1_position);
// Show all points
if (show_points) {
glEnable(GL_LIGHTING);
static GLfloat material[4] = { 0, 0, 1, 1 };
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, material);
for (int i = 0; i < all_points.NEntries(); i++) {
TestPoint *point = all_points[i];
R3Sphere(point->position, 0.01).Draw();
}
}
// Show nearby points
if (selected_point && !nearby_points.IsEmpty()) {
glEnable(GL_LIGHTING);
static GLfloat material[4] = { 1, 0, 0, 1 };
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, material);
for (int i = 0; i < nearby_points.NEntries(); i++) {
TestPoint *point = nearby_points.Kth(i);
R3Sphere(point->position, 0.02).Draw();
}
}
// Show closest point
if (selected_point && closest_point) {
glEnable(GL_LIGHTING);
static GLfloat material[4] = { 0, 1, 0, 1 };
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, material);
R3Sphere(closest_point->position, 0.03).Draw();
}
// Show selected point
if (selected_point) {
glEnable(GL_LIGHTING);
static GLfloat material[4] = { 1, 1, 1, 1 };
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, material);
R3Sphere(selected_point->position, 0.05).Draw();
}
// Show constraints
if (0 && show_constraints) {
glDisable(GL_LIGHTING);
glColor3f(0.5, 0, 0);
R3Sphere(selected_point->position, min_nearby_distance).Outline();
R3Sphere(selected_point->position, max_nearby_distance).Outline();
}
// Show KD tree
if (show_kdtree) {
glDisable(GL_LIGHTING);
glColor3f(0, 0, 0);
kdtree->Outline();
}
// Swap buffers
glutSwapBuffers();
}
int R3Model::
ReadObjFile(const char *filename)
{
// Open file
FILE *fp = fopen(filename, "r");
if (!fp) {
RNFail("Unable to open file %s", filename);
return 0;
}
// Determine directory name (for texture image files)
char dirname[1024];
strncpy(dirname, filename, 1024);
char *endp = strrchr(dirname, '/');
if (!endp) endp = strrchr(dirname, '\\');
if (!endp) strcpy(dirname, ".");
else *endp = '\0';
// Read body
char buffer[1024];
int line_count = 0;
int material_index =-1;
RNArray<R2Point *> texture_coords;
RNArray<R3TriangleVertex *> verts;
RNArray<R3Triangle *> tris;
while (fgets(buffer, 1023, fp)) {
// Increment line counter
line_count++;
// Skip white space
char *bufferp = buffer;
while (isspace(*bufferp)) bufferp++;
// Skip blank lines and comments
if (*bufferp == '#') continue;
if (*bufferp == '\0') continue;
// Get keyword
char keyword[80];
if (sscanf(bufferp, "%s", keyword) != 1) {
RNFail("Syntax error on line %d in file %s", line_count, filename);
return 0;
}
// Check keyword
if (!strcmp(keyword, "v")) {
// Read vertex coordinates
double x, y, z;
if (sscanf(bufferp, "%s%lf%lf%lf", keyword, &x, &y, &z) != 4) {
RNFail("Syntax error on line %d in file %s", line_count, filename);
return 0;
}
// Create vertex
R3TriangleVertex *vertex = new R3TriangleVertex(R3Point(x, y, z));
verts.Insert(vertex);
}
else if (!strcmp(keyword, "vt")) {
// Read texture coordinates
double u, v;
if (sscanf(bufferp, "%s%lf%lf", keyword, &u, &v) != 3) {
RNFail("Syntax error on line %d in file %s", line_count, filename);
return 0;
}
// Create texture coordinates
R2Point *vt = new R2Point(u, v);
texture_coords.Insert(vt);
}
else if (!strcmp(keyword, "f")) {
// Read vertex indices
int quad = 1;
char s1[128], s2[128], s3[128], s4[128] = { '\0' };
if (sscanf(bufferp, "%s%s%s%s%s", keyword, s1, s2, s3, s4) != 5) {
quad = 0;;
if (sscanf(bufferp, "%s%s%s%s", keyword, s1, s2, s3) != 4) {
RNFail("Syntax error on line %d in file %s", line_count, filename);
return 0;
}
}
// Parse vertex indices
int vi1 = -1, vi2 = -1, vi3 = -1, vi4 = -1;
int ti1 = -1, ti2 = -1, ti3 = -1, ti4 = -1;
char *p1 = strchr(s1, '/');
if (p1) { *p1 = 0; vi1 = atoi(s1); p1++; if (*p1) ti1 = atoi(p1); }
else { vi1 = atoi(s1); ti1 = vi1; }
char *p2 = strchr(s2, '/');
if (p2) { *p2 = 0; vi2 = atoi(s2); p2++; if (*p2) ti2 = atoi(p2); }
else { vi2 = atoi(s2); ti2 = vi2; }
char *p3 = strchr(s3, '/');
if (p3) { *p3 = 0; vi3 = atoi(s3); p3++; if (*p3) ti3 = atoi(p3); }
else { vi3 = atoi(s3); ti3 = vi3; }
if (quad) {
char *p4 = strchr(s4, '/');
if (p4) { *p4 = 0; vi4 = atoi(s4); p4++; if (*p4) ti4 = atoi(p4); }
else { vi4 = atoi(s4); ti4 = vi4; }
}
// Get vertices
R3TriangleVertex *v1 = verts.Kth(vi1-1);
R3TriangleVertex *v2 = verts.Kth(vi2-1);
R3TriangleVertex *v3 = verts.Kth(vi3-1);
R3TriangleVertex *v4 = (quad) ? verts.Kth(vi4-1) : NULL;
// Assign texture coordinates
if ((ti1 >= 0) && (ti1 < texture_coords.NEntries())) v1->SetTextureCoords(*(texture_coords.Kth(ti1-1)));
if ((ti2 >= 0) && (ti2 < texture_coords.NEntries())) v2->SetTextureCoords(*(texture_coords.Kth(ti2-1)));
if ((ti3 >= 0) && (ti3 < texture_coords.NEntries())) v3->SetTextureCoords(*(texture_coords.Kth(ti3-1)));
if (quad) {
if ((ti4 >= 0) && (ti4 < texture_coords.NEntries())) v4->SetTextureCoords(*(texture_coords.Kth(ti4-1)));
}
// Check vertices
if ((v1 == v2) || (v2 == v3) || (v1 == v3)) continue;
if ((quad) && ((v4 == v1) || (v4 == v2) || (v4 == v3))) quad = 0;
// Create default material, if needed
if (material_index == -1) {
R3Brdf *brdf = new R3Brdf(RNRgb(0.2, 0.2, 0.2), RNRgb(0.8, 0.8, 0.8),
RNRgb(0.0, 0.0, 0.0), RNRgb(0.0, 0.0, 0.0), 0.2, 1.0, 1.0);
R3Material *material = new R3Material(brdf, "Default");
materials.Insert(material);
RNArray<R3Triangle *> *mat_tris = new RNArray<R3Triangle *>();
material_triangles.Insert(mat_tris);
material_index = 0;
}
// Get material
assert(material_index >= 0);
R3Material *material = materials.Kth(material_index);
// Create first triangle
R3Triangle *triangle = new R3Triangle(v1, v2, v3);
tris.Insert(triangle);
triangle_materials.Insert(material);
material_triangles[material_index]->Insert(triangle);
// Create second triangle
if (quad) {
R3Triangle *triangle = new R3Triangle(v1, v3, v4);
tris.Insert(triangle);
triangle_materials.Insert(material);
material_triangles[material_index]->Insert(triangle);
}
}
else if (!strcmp(keyword, "mtllib")) {
// Read fields
char mtlname[1024];
if (sscanf(bufferp, "%s%s", keyword, mtlname) != 2) {
RNFail("Syntax error on line %d in file %s", line_count, filename);
return 0;
}
// Read materials
if (!ReadObjMtlFile(dirname, mtlname)) return 0;
}
else if (!strcmp(keyword, "usemtl")) {
// Read fields
char mtlname[1024];
if (sscanf(bufferp, "%s%s", keyword, mtlname) != 2) {
RNFail("Syntax error on line %d in file %s", line_count, filename);
return 0;
}
// Find material
material_index = FindMaterialIndex(materials, mtlname);
if (material_index == -1) {
fprintf(stderr, "Unable to find material %s at on line %d in file %s", mtlname, line_count, filename);
return 0;
}
}
}
// Create triangle array
triangles = new R3TriangleArray(verts, tris);
// Delete texture coordinates
for (int i = 0; i < texture_coords.NEntries(); i++) {
R2Point *vt = texture_coords.Kth(i);
delete vt;
}
// Close file
fclose(fp);
// Return success
return 1;
}
