154
edits
Changes
→GAM670/DPS905 -- Weekly Schedule 20121
*: definition, purpose of a billboard
*: types of billboards
*:: screen-aligned - useful for annotation text
*::: normal is opposite to camera heading
*::: up is camera->up
*:: axial - useful for cylindrical symmetry - trees (textured object does not face straight on)
*::: up is fixed
*::: normal faces the viewer as much as possible
*:: view_plane - no distortion - useful for
*::: normal is fixed (opposite to camera heading)
*::: up is open to change
*:: viewpoint - simulates distortion due to perspective projection - useful for clouds
*::: normal is fixed (difference between viewpoint position and camera heading)
*::: up is open to change
* Visibility Determination
**: test a point for presence within a set of planes