[Algorithms] RTS simple circle shadows

[Ryan De B. <RD...@im...>]

In an RTS game where you could have many units on the screen at once,
many games use a simple circle shadow. Is projective texturing generally
used to get the shadow on the ground? You can only project so many
textures in a single pass, and doing a large number of them should
affect framerate. Maybe they project all the shadows onto a large quad,
and then project that texture onto the ground. Or perhaps they have
small quads underneath each character just above the ground textured
with the circle shadow, but then it would only work on relatively flat
ground. Which technique is generally used?

-Ryan De Boer



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