   FBO needs Color attachment?
  Well it fails if I dont attach the color buffer, but there must be a way to not attach a color buffer on newer hardware somehow. I mean I would think with shadow maps that they would support just depth attachments.I'll probably figure this bug out too, right now I can render to the fbo, but once depth testing is enabled, nothing re-draws. I do call glClear while it is attached. Ideas?[Edited by - dpadam450 on May 10, 2009 4:27:52 PM]
  If you want to use only depth attachment, then you have to disable writing to and reading from color buffers. It can be done with glDrawBuffer(GL_NONE) and glReadBuffer(GL_NONE).   ;  Yes, it is possiblehttp://opengl.org/wiki/GL_EXT_framebuffer_object_More_about_FBOs