Algodoo

This scene is considered a tutorial. Under normal conditions, when you move or relocate a box or circle that has a texture (i.e., Texture = " .jpg, .png, .gif, or .bmp" file), the texture moves in a fixed position relative to the geometry along with the geometry. But there may be a situation where you do not want the texture to move with the geometry, but rather have it stay put relative to the background, and as you move or relocate the circle or box, you will see a different view of the texture because the geometry is now "looking" at a different location on the texture. The result is like moving a glass window to a new location on the wall of your house. You will see a different view of the same scenery outside the house. If this doesn't make sense, run the scene and then I think you will understand what I'm saying.

EDIT - Corrected slight texture movement in the circle that moves across the scene from left to right. Now the texture and the circle move EXACTLY in synch. My thanks to s_noonan for catching this little bug.