OpenGL CubeMap Texture Dimensions
void loadCubemapTextures(){
glGenTextures(1, &cubemap);
glBindTexture(GL_TEXTURE_CUBE_MAP, cubemap);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glDrawBuffer(GL_AUX1);
glReadBuffer(GL_AUX1);
glMatrixMode(GL_MODELVIEW);
//Generate cube map textures
for(int i = 0; i < 6; i++){
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
//Viewing Transformation
gluLookAt(pos[0], pos[1], pos[2],
view_pos[i][0], view_pos[i][1], view_pos[i][2],
top[i][0], top[i][1], top[i][2]);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspecti开发者_如何学运维ve(90.0, 1.0, cubemapRadius + 1, 200.0);
glMatrixMode(GL_MODELVIEW);
render();
glCopyTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB, 0, 0, 256, 256, 0);
}
Your walls lack enough features to make their orientation and location clear, but I would bet those are the issue.
The values you have in view_pos
and top
are what define those. Among the things that look suspicious:
- the black at the bottom of the shere comes from the face that captured the front view. It should be at the top (ie it's either flipped, or rotated 180).
- likewise, the black that comes from the back of the view (in the center of the sphere) looks turned by a quarter of a circle (as black goes on the left rather than being on the top).
- the reflection of the map sphere looks weird. It lacks resolution to figure out exactly what this is.
Anyways, to fix it, you can either make sure your values are what is expected from a proper cube-map definition (as in check all the specification), or just do a bunch of trial and error, after adding enough geometry to figure out what the orientation of each face is.
The problem had nothing to do with coordinates, thanks for the input though. I had forgotten to set the view matrix... a simple call to gluViewport inside the for-loop fixed it for me.
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