I’m trying to modify the sample code for loading 3d model included in ASSIMP’s sample code, by using GLUT instead of WGL. However, i got a problem with the texture, as illustrated below:
while it is supposed to be as illustrated below:
and the code for drawing the 3d model listed below:
void recursive_render (const struct aiScene *sc, const struct aiNode* nd, float scale){
unsigned int i;
unsigned int n=0, t;
struct aiMatrix4x4 m = nd->mTransformation;
m.Scaling(aiVector3D(scale, scale, scale), m);
// update transform
m.Transpose();
glPushMatrix();
glMultMatrixf((float*)&m);
// draw all meshes assigned to this node
for (; n < nd->mNumMeshes; ++n){
const struct aiMesh* mesh = scene->mMeshes[nd->mMeshes[n]];
apply_material(sc->mMaterials[mesh->mMaterialIndex]);
if(mesh->mNormals == NULL){
glDisable(GL_LIGHTING);
}
else {
glEnable(GL_LIGHTING);
}
if(mesh->mColors[0] != NULL) {
glEnable(GL_COLOR_MATERIAL);
}
else {
glDisable(GL_COLOR_MATERIAL);
}
for (t = 0; t < mesh->mNumFaces; ++t) {
const struct aiFace* face = &mesh->mFaces[t];
GLenum face_mode;
switch(face->mNumIndices) {
case 1: face_mode = GL_POINTS; break;
case 2: face_mode = GL_LINES; break;
case 3: face_mode = GL_TRIANGLES; break;
default: face_mode = GL_POLYGON; break;
}
glBegin(face_mode);
for(i = 0; i < face->mNumIndices; i++){
int vertexIndex = face->mIndices[i]; // get group index for current index
if(mesh->mColors[0] != NULL)
Color4f(&mesh->mColors[0][vertexIndex]);
if(mesh->mNormals != NULL)
if(mesh->HasTextureCoords(0)){
glTexCoord2f(mesh->mTextureCoords[0][vertexIndex].x, 1- mesh->mTextureCoords[0][vertexIndex].y);
}
glNormal3fv(&mesh->mNormals[vertexIndex].x);
glVertex3fv(&mesh->mVertices[vertexIndex].x);
}
glEnd();
}
}
// draw all children
for (n = 0; n < nd->mNumChildren; ++n) {
recursive_render(sc, nd->mChildren[n], scale);
}
glPopMatrix();
}
apply_material function, almost exactly the same as ASSIMP provided sample
void apply_material(const struct aiMaterial *mtl)
{
float c[4];
GLenum fill_mode;
int ret1, ret2;
struct aiColor4D diffuse;
struct aiColor4D specular;
struct aiColor4D ambient;
struct aiColor4D emission;
float shininess, strength;
int two_sided;
int wireframe;
unsigned int max; // changed: to unsigned
int texIndex = 0;
aiString texPath; //contains filename of texture
if(AI_SUCCESS == mtl->GetTexture(aiTextureType_DIFFUSE, texIndex, &texPath)) {
unsigned int texId = textureIdMap[texPath.data];
glBindTexture(GL_TEXTURE_2D, texId);
}
set_float4(c, 0.8f, 0.8f, 0.8f, 1.0f);
if(AI_SUCCESS == aiGetMaterialColor(mtl, AI_MATKEY_COLOR_DIFFUSE, &diffuse))
color4_to_float4(&diffuse, c);
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, c);
set_float4(c, 0.2f, 0.2f, 0.2f, 1.0f);
if(AI_SUCCESS == aiGetMaterialColor(mtl, AI_MATKEY_COLOR_AMBIENT, &ambient))
color4_to_float4(&ambient, c);
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, c);
set_float4(c, 0.0f, 0.0f, 0.0f, 1.0f);
if(AI_SUCCESS == aiGetMaterialColor(mtl, AI_MATKEY_COLOR_SPECULAR, &specular))
color4_to_float4(&specular, c);
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, c);
set_float4(c, 0.0f, 0.0f, 0.0f, 1.0f);
if(AI_SUCCESS == aiGetMaterialColor(mtl, AI_MATKEY_COLOR_EMISSIVE, &emission))
color4_to_float4(&emission, c);
glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, c);
max = 1;
ret1 = aiGetMaterialFloatArray(mtl, AI_MATKEY_SHININESS, &shininess, &max);
max = 1;
ret2 = aiGetMaterialFloatArray(mtl, AI_MATKEY_SHININESS_STRENGTH, &strength, &max);
if((ret1 == AI_SUCCESS) && (ret2 == AI_SUCCESS))
glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, shininess * strength);
else {
glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 0.0f);
set_float4(c, 0.0f, 0.0f, 0.0f, 0.0f);
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, c);
}
max = 1;
if(AI_SUCCESS == aiGetMaterialIntegerArray(mtl, AI_MATKEY_ENABLE_WIREFRAME, &wireframe, &max))
fill_mode = wireframe ? GL_LINE : GL_FILL;
else
fill_mode = GL_FILL;
glPolygonMode(GL_FRONT_AND_BACK, fill_mode);
max = 1;
if((AI_SUCCESS == aiGetMaterialIntegerArray(mtl, AI_MATKEY_TWOSIDED, &two_sided, &max)) && two_sided)
glEnable(GL_CULL_FACE);
else
glDisable(GL_CULL_FACE);
}
and also loadGLtextures function, i don’t think it is related with culling tough.
int LoadGLTextures(const aiScene* scene) {
ILboolean success;
/* initialization of DevIL */
ilInit();
/* scan scene's materials for textures */
for (unsigned int m=0; m<scene->mNumMaterials; ++m) {
int texIndex = 0;
aiString path; // filename
aiReturn texFound = scene->mMaterials[m]->GetTexture(aiTextureType_DIFFUSE, texIndex, &path);
while (texFound == AI_SUCCESS) {
//fill map with textures, OpenGL image ids set to 0
textureIdMap[path.data] = 0;
// more textures?
texIndex++;
texFound = scene->mMaterials[m]->GetTexture(aiTextureType_DIFFUSE, texIndex, &path);
}
}
int numTextures = textureIdMap.size();
/* create and fill array with DevIL texture ids */
ILuint* imageIds = new ILuint[numTextures];
ilGenImages(numTextures, imageIds);
/* create and fill array with GL texture ids */
GLuint* textureIds = new GLuint[numTextures];
glGenTextures(numTextures, textureIds); /* Texture name generation */
/* get iterator */
std::map<std::string, GLuint>::iterator itr = textureIdMap.begin();
printf("TextureIDMap Begin %i\n", textureIdMap.begin());
int i=0;
for (; itr != textureIdMap.end(); ++i, ++itr) {
//save IL image ID
std::string filename = (*itr).first; // get filename
(*itr).second = textureIds[i]; // save texture id for filename in map
printf("Texture loaded: %s\n",filename.c_str());
printf("Texture ID Map End: %i\n",textureIdMap.end());
ilBindImage(imageIds[i]); /* Binding of DevIL image name */
ilEnable(IL_ORIGIN_SET);
ilOriginFunc(IL_ORIGIN_LOWER_LEFT);
success = ilLoadImage((ILstring)filename.c_str());
if (success) {
/* Convert image to RGBA */
ilConvertImage(IL_RGBA, IL_UNSIGNED_BYTE);
/* Create and load textures to OpenGL */
glBindTexture(GL_TEXTURE_2D, textureIds[i]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, ilGetInteger(IL_IMAGE_WIDTH),
ilGetInteger(IL_IMAGE_HEIGHT), 0, GL_RGBA, GL_UNSIGNED_BYTE,
ilGetData());
}
else
printf("Couldn't load Image: %s\n", filename.c_str());
}
/* Because we have already copied image data into texture data we can release memory used by image. */
ilDeleteImages(numTextures, imageIds);
//Cleanup
delete [] imageIds;
delete [] textureIds;
//return success;
return true;
}
Lighthouse 3D has given an example for doing this, however, at the moment i can not implement GLSL and VAO to my program. Any solution? Thanks in advance.
I’ve found the workaround. I changed how to access textures in
recursive_renderfunction using the following code :instead of: