Where can I learn about detecting collisions between meshes and primitives, and between meshes against each other? I was also wondering whether or not directx 8, or more specifically Direct Graphics, automatically doesn''t render things that aren''t in your view. if not, where are some good algorithms that can do that? When making a 3d world and using the mouse for free view, i thought it would be a good thing to use the keyboard as camera position and mouse for camera look at position. that way you can strafe and go forward and backward with the keyboard and free look with the mouse. i have the code setup where i can use the mouse and keyboard, but what kind of algorithms should is use for the free view. i want to be able to turn all the way around with the mouse. i think my biggest problem is getting the Z axis in camera look at position to be the same distance no matter which direction i point the mouse. i also want to be able to keep the mouse in the center of the screen. thanks ahead. im using directX 8 with VC++ 6