Apple

On Oct 28, 2013, at 11:02 AM, Ardo Avancena <email@hidden> wrote:

Darrin,

Thanks a lot! I see that I could get away without using a framebuffer for this one and it appears to work correctly with regards to the depth problem but now the image is tearing up. Here is a screenshot of what happens.
http://img.photobucket.com/albums/v442/ardo/ScreenShot2013-10-28at105652AM.png

Thanks!!

On Mon, Oct 28, 2013 at 9:44 AM, Darrin Cardani <email@hidden> wrote:

Ardo,

I took some time over the weekend to update the BoxTest example to show you how to add a depth buffer to the FBO that the host app gives to you. Here it is:

There’s a #define that you can turn on and off to see the difference. Note that this version draws a box (as its name suggests), and that normally backface culling is on. For a cube, backface is sufficient to draw the cube correctly. So in this example, I’ve turned it off so that you can see that without the depth buffer it does not draw correctly.

To see it in action, build the plug-in, put it in the appropriate place and run Motion. Create a new project, add a camera to the project, then add the generator. You should then be able to orbit the camera around the cube and see that it draws correctly. Note that in its default position, the cube will clip as you orbit around so you probably should move it back or move the camera farther away from it.

Let me know if this example makes sense.

Darrin

On Oct 25, 2013, at 4:51 PM, Ardo Avancena <email@hidden> wrote:

Oh, I tried making two squares and had them overlap at certain coordinates as the generator is loading, it was not behaving consistently. In some cases square a was behind when its z coordinates are negative then move infront after a while.

Is it because i have my framebuffer created on render thats causing this?

On Fri, Oct 25, 2013 at 2:43 PM, Christoph Vonrhein <email@hidden> wrote:

To test if your framebuffer is really working draw two simple ractangles that intercect in the 3D space. Then you can see if your problem is connected to the Z-buffer.

Christoph Vonrhein

On Oct 25, 2013, at 5:00 PM, Ardo Avancena <email@hidden> wrote:

I believe so,

from OpenGL profiler, when my framebuffer is bound, the state for depth is:
GL_DEPTH_TEST = enabled

GL_DEPTH_BITS = 24

GL_DEPTH_CLEAR_VALUE = 1
GL_DEAPTH_FUNC = GL_LESS
GL_DEPTH_RANGE {0,1}
GL_DEPTH_WRITEMASK = GL_TRUE
GL_DEPTH_CLAMP_NV = disabled
GL_DEPTH_BOUNDS_TEST_EXT = disabled

GL_DEPTH_BOUNDS_EXT = {0,1}

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