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FBO's, Render Buffers, Shadow Problem

Started by Lopez Dec 8, 2005 at 10:52 AM 3 replies 400+ views

Original Post

Dec 8, 2005 at 10:52 AM

Hi there, I am currently trying to implement shadowmapping using FBO's. I have been setting up the FBO and renderbuffer as shown in another thread - without getting any problems. I can currently render the color to the scene as a projection, but when i try and render the depth map on the scene, i just get black, with a thin lighter border around the edge of the projection, as if all the depth values are 0. Any ideas please? If code is needed, I will post later.

Lopez

Author

Lopez

Dec 8, 2005 at 11:23 AM

Here the init code:

	shadowMapTexture	=	_textureman->CreateDepth(D_shadowmap_size_x, D_shadowmap_size_y);	color_tex			=	_textureman->Create(D_shadowmap_size_x, D_shadowmap_size_y);	//	Framebuffer	glGenFramebuffersEXT(1, &fb);	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);	glGenRenderbuffersEXT(1, &depth_rb);	glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, depth_rb);	glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT24, D_shadowmap_size_x, D_shadowmap_size_y);	//	Attach everything	glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, color_tex, 0);	glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, depth_rb);	//	Unbind	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);

and during the update()

	//	pixel buffer stuff	glGetIntegerv(GL_DRAW_BUFFER, &_currentDrawbuf); // Save the current Draw buffer// draw to the texture	glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, _lightman->getLight(0)->fb);	glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);			 // Draw into the first texture	glDrawBuffer(GL_DEPTH_ATTACHMENT_EXT);			 // Draw into the first texture//          draw the stuff	glDrawBuffer(_currentDrawbuf);

MARS_999

363

MARS_999

Dec 8, 2005 at 12:53 PM

what gfx card are you using? If ATI change your depth components to 16 not 24 for you FBO's

Lopez

Author

Lopez

Dec 8, 2005 at 1:12 PM

i'm using a crappy creative fx5600 128m.

MARS_999

363

MARS_999

Dec 8, 2005 at 1:45 PM

what is your near far planes set to? try 3.0 and 100.0 or so don't use less than one on the near plane if you can

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