I have some questions about Post Processing Stage.
1、I guess whether the PostProcessingStage only support to receive fragment Shader?
2、Where or how can I code vertex Shader for it？
3、Do it need some vertex Shader to run correctly?
var fs =
'uniform sampler2D colorTexture;\n' +
'varying vec2 v_textureCoordinates;\n' +
'uniform float scale;\n' +
'uniform vec3 offset;\n' +
'void main() {\n' +
' vec4 color = texture2D(colorTexture, v_textureCoordinates);\n' +
' gl_FragColor = vec4(color.rgb * scale + offset, 1.0);\n' +
'}\n';
scene.postProcessStages.add(new Cesium.PostProcessStage({
fragmentShader : fs,// only fragment Shader ?
uniforms : {
scale : 1.1,
offset : function() {
return new Cesium.Cartesian3(0.1, 0.2, 0.3);
}
}
}));