Depth buffer

[andrewjworz]

Alright, one more question: Is there a way to size the quad so that is fits the exact dimensions of the window? I've tried, but I'm not sure how the 'size' parameter in viz.addTexQuad method translates into window coordinates.

I have tried inserting the following code into what you have written:

# Get window size
winsize = viz.MainWindow.getSize(viz.WINDOW_PIXELS)

# Display depth texture on the screen
quad = viz.addTexQuad(viz.SCREEN, size=1 ,align=viz.TEXT_CENTER_CENTER)
quad.setPosition(.5,.5,0)
quad.scale(winsize[0],winsize[1])

[farshizzo]

If you want to view it fullscreen, then you're better off implementing the shader as a post-process effect:

import viz
viz.go()

viz.add('piazza.osgb')

NEAR = 0.1
FAR = 200.0

from vizfx.postprocess.effect import BaseShaderEffect

class DepthEffect(BaseShaderEffect):

	def _getFragmentCode(self):
		return """
		uniform sampler2D vizpp_InputDepthTex;
		uniform float near;
		uniform float far;
		void main()
		{
			float d = texture2D(vizpp_InputDepthTex,gl_TexCoord[0].st).r;
			float z = (2 * near) / (far + near - d * (far - near));
			gl_FragColor = vec4(z,z,z,1.0);
		}
		"""

	def _createUniforms(self):
		self.uniforms.addFloat('near',NEAR)
		self.uniforms.addFloat('far',FAR)

viz.clip(NEAR,FAR)

import vizfx.postprocess
effect = DepthEffect()
vizfx.postprocess.addEffect(effect)