Question

I have a blender obj. file in an OpenGL application. I have also added a camera so that it will move in around that object (it’s a building, so it’s pretty large). The frame rate on it is awful.

Why is it slow and/or how can I make it faster?

void camera (void) {
glRotatef(xrot,1.0,0.0,0.0);  
glRotatef(yrot,0.0,1.0,0.0);  
glTranslated(-xpos,-ypos,-zpos); }

This is just my simple camera class. Just in case it helps.

Answer 1

There are some reasons your code might be slow:

• You aren’t using VertexBuffer objects
• You are using the fixed function pipeline and not shaders
• You aren’t optimizing your drawing code that only areas are rendered which are visible ( look a.e. for bsp-trees )

After all you’ve a lot of optimizations to do. I would start with optimizing my render pipeline and remove the fixed function pipeline and start to use shaders and vertex-buffers.