WorldViz User Forum - manipulate contrast for one eye?

The following scripts shows how to use the post-process module to apply a contrast shader to the right eye. Let me know if anything is unclear.

Code:

import viz

viz.go(viz.STEREO_HORZ)



viz.add('gallery.ive')



import vizpp



left_frag = """

uniform sampler2D vizpp_InputTex;

void main()

{

        gl_FragColor = texture2D(vizpp_InputTex,gl_TexCoord[0].xy);

}

"""



right_frag = """

uniform sampler2D vizpp_InputTex;

uniform float contrast;

void main()

{

        vec4 color = texture2D(vizpp_InputTex,gl_TexCoord[0].xy);

        gl_FragColor.rgb = mix(vec3(0.5,0.5,0.5),color.rgb,contrast);

        gl_FragColor.a = color.a;

}

"""



class StereoEffect(vizpp.PostProcessEffect):



        def _setupEffect(self):

                self._contrast = viz.addUniformFloat('contrast',1.0)

                self._leftShader = viz.addShader(frag=left_frag)

                self._rightShader = viz.addShader(frag=right_frag)

                self._rightShader.attach(self._contrast)



        def _applyEffect(self,data):

                if data.eye == viz.RIGHT_EYE:

                        data.overlay.apply(self._rightShader)

                else:

                        data.overlay.apply(self._leftShader)



        def setContrast(self,value):

                self._contrast.set(value)



        def getContrast(self):

                return self._contrast.get()



effect = StereoEffect()

effect.setContrast(2.0)



vizpp.addEffect(effect)