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Index › Programming Questions & Help › Other Libraries › MRI3DS and OpenGL state
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MRI3DS and OpenGL state (Read 1489 times)
nikp
MRI3DS and OpenGL state
Apr 23rd, 2010, 11:52pm  
Hi all, i have gotten my .3ds model into my application using mri3ds.  However i notice that some OpenGL state is set by the mri3ds scene/scene render and all normal processing calls are affected by that.  For instance if you draw a simple filled rectangle then it renders way darker than it would if i comment out the render of the 3ds scene.  I guess somehow i can push&pop the opengl/processing state around the vscene.draw() call.  

I guess i could just make sure the lights in my 3ds scene are set to pure white as that would work best for me anyhow..however i have a feeling that one would like to keep all opengl state within a scene as local to that scene rather than it become "accidentally" global.

any thoughts?

Oh and some simple code like this shows the issue.

vscene.draw();
noLights();
fill(255,0,0);
rect(0,0,height/2,width);
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V
Re: MRI3DS and OpenGL state
Reply #1 - Apr 24th, 2010, 9:31am  
the only things the draw method does is set texture or color material.
after calling draw() try to disable color_material and see if that fixes your problem.

// disable color material
_gl.glDisable( GL.GL_COLOR_MATERIAL );
// disable texturing
_gl.glBindTexture( GL.GL_TEXTURE_2D, 0 );
_gl.glDisable( GL.GL_TEXTURE_2D );
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Victor Martins | www.pixelnerve.com/v
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nikp
Re: MRI3DS and OpenGL state
Reply #2 - Apr 25th, 2010, 5:39pm  
Many thanks Victor that fixed it..it seems that either of these two calls fix the problem.
_gl.glBindTexture( GL.GL_TEXTURE_2D, 0 );
_gl.glDisable( GL.GL_TEXTURE_2D );

And this

_gl.glDisable( GL.GL_COLOR_MATERIAL );

doesn't make a difference in this case.

thanks

nik
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V
Re: MRI3DS and OpenGL state
Reply #3 - Apr 25th, 2010, 5:59pm  
ok the first two ones unbind the texture and disable texture mapping.
the second is for material colors.

next release i'll fix this within the draw methods
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Victor Martins | www.pixelnerve.com/v
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