Apple

On Fri, Oct 25, 2013 at 1:46 PM, Christoph Vonrhein <email@hidden> wrote:

Does your framebuffer have a Depth (Z) channel?

Christoph Vonrhein

On Oct 25, 2013, at 1:47 PM, Ardo Avancena <email@hidden> wrote:

I'm Trying to look at a shape in 3D space but when I look at it at a certain angle it draws over itself.
here is what it looks like
http://img.photobucket.com/albums/v442/ardo/ScreenShot2013-10-25at103416AM.png

The screenshot is viewed from the top, and the supposedly bottom part of the shape is seen through the top view.

I wrote my FBO like this:
//This is all done per rendering just to figure this one out first

//getting motion's fbo to return to
            GLint originalFramebuffer;
            glGetIntegerv(GL_FRAMEBUFFER_BINDING, &originalFramebuffer);

            GLuint fbo;
            glGenFramebuffers(1, &fbo);
            glBindFramebuffer(GL_FRAMEBUFFER, fbo);

            //Creating texture for framebuffer
            GLuint texColorBuffer;
            glGenTextures(1, &texColorBuffer);
            glBindTexture([outTex target], texColorBuffer);
            //Having it as null means the texture's data will be created dynamically
            //Using RGBA since the alpha layer is going to be needed
            glTexImage2D([outTex target], 0, GL_RGBA, 1920, 1080, 0, GL_RGBA_FLOAT16_APPLE, GL_UNSIGNED_BYTE, NULL);

            glTexParameteri([outTex target], GL_TEXTURE_MIN_FILTER, GL_LINEAR);
            glTexParameteri([outTex target], GL_TEXTURE_MAG_FILTER, GL_LINEAR);
            //Attach texture to framebuffer
            glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, [outTex target], texColorBuffer, 0);

            //Creating render buffer
            GLuint renderBuffer;
            glGenRenderbuffers(1, &renderBuffer);
            glBindRenderbuffer(GL_RENDERBUFFER, renderBuffer);
            glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, 1920, 1080);

            //Binding the renderbuffer to the framebuffer
            glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, renderBuffer);

//start using framebuffer

glBindFramebuffer(GL_FRAMEBUFFER, fbo);

//This part is drawing my shape

//initating glTex0
            glActiveTexture(GL_TEXTURE0);

            [linkedTexture enable];
            glBindTexture([outTex target], [linkedTexture textureId]);

            //setting up texture stuff
            glViewport(0, 0, 1920, 1080);
            glClearColor(1, 1, 1, 0);
            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
            glDisable(GL_CULL_FACE);
            glEnable(GL_DEPTH_TEST);

//this sets up my shape
            glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4, &compoundPoints[0][0][0]);
            glEnable(GL_MAP2_VERTEX_3);

            //This sets up the texture/image
            glMap2f(GL_MAP2_TEXTURE_COORD_2, 0, 1, 2, 2, 0, 1, 4, 2, &texpts[0][0][0]);
            glEnable(GL_MAP2_TEXTURE_COORD_2);

            //This keeps the shapes's size intact
            glMapGrid2f(20, 0.0, 1.0, 20, 0.0, 1.0);

//End of framebuffer usage
            glBindFramebuffer(GL_FRAMEBUFFER, originalFramebuffer);
            glViewport(0, 0, 1920, 1080);

glActiveTexture(GL_TEXTURE0);
//drawing my shape
            glEvalMesh2(GL_FILL, 0, 20, 0, 20);

What I end up getting is the shape with the appropriate texture. Is there a different way of drawing the shape for my goal?

Thanks!

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References:
	>Framebuffer with depth attachment (From: Ardo Avancena <email@hidden>)
	>Re: Framebuffer with depth attachment (From: Christoph Vonrhein <email@hidden>)