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Asked: 2026-05-11T09:26:33+00:00

I’m looking for an alternative technique for rendering reflections in OpenGL ES on the

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I’m looking for an alternative technique for rendering reflections in OpenGL ES on the iPhone. Usually I would do this by using the stencil buffer to mark where the reflection can be seen (the reflective surface) and then render the reversed image only in those pixels. Thus when the reflected object moves off the surface its reflection is no longer seen. However, since the iPhone’s implementation doesn’t support the stencil buffer I can’t determine how to hide the portions of the reflection that fall outside of the surface.

To clarify, the issue isn’t rendering the reflections themselves, but hiding them when they wouldn’t be visible.

Any ideas?

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1 Answer

  1. Render the reflected scene first; copy out to a texture using glCopyTexImage2D; clear the framebuffer; draw the scene proper, applying the copied texture to the reflective surface.

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