Billboards, Impostors, Sprites
- Particles can be displayed as small images/thumbnails (instead of simple sphere)
- In practice
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- - Each particle is displayed as a quadrangle
- - A texture is mapped on the quad
- - The texture can contain transparency : quad geometry is invisible
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- Fake a more complex geometry
- - The quad can be facing the camera at all time (billboard)
- - The texture can be animated (sprite)
- - Texture can be adapted to the point of view (impostors)
