| Name | Type | Description | ||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
options |
Object | 具有以下属性的对象：
|
Throws:
-
DeveloperError : 选项.textureScale必须大于0.0且小于或等于1.0。
-
DeveloperError : 选项.pixelFormat必须是颜色格式。
-
DeveloperError ：什么时候选项.像素数据类型是FLOAT，则此WebGL实现必须支持OES_texture_FLOAT扩展。检查context.floatingPointTexture.
Examples:
// Simple stage to change the color
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,
uniforms : {
scale : 1.1,
offset : function() {
return new Cesium.Cartesian3(0.1, 0.2, 0.3);
}
}
}));// Simple stage to change the color of what is selected.
// If czm_selected returns true, the current fragment belongs to geometry in the selected array.
var fs =
'uniform sampler2D colorTexture;\n' +
'varying vec2 v_textureCoordinates;\n' +
'uniform vec4 highlight;\n' +
'void main() {\n' +
' vec4 color = texture2D(colorTexture, v_textureCoordinates);\n' +
' if (czm_selected()) {\n' +
' vec3 highlighted = highlight.a * highlight.rgb + (1.0 - highlight.a) * color.rgb;\n' +
' gl_FragColor = vec4(highlighted, 1.0);\n' +
' } else { \n' +
' gl_FragColor = color;\n' +
' }\n' +
'}\n';
var stage = scene.postProcessStages.add(new Cesium.PostProcessStage({
fragmentShader : fs,
uniforms : {
highlight : function() {
return new Cesium.Color(1.0, 0.0, 0.0, 0.5);
}
}
}));
stage.selected = [cesium3DTileFeature];See:
Members
readonly clearColor : Color
The shader must contain a sampler uniform declaration for colorTexture, depthTexture,
or both.
The shader must contain a vec2 varying declaration for v_textureCoordinates for sampling
the texture uniforms.
PostProcessStageComposite中的其他阶段参考。readonly pixelDatatype : PixelDatatype
readonly pixelFormat : PixelFormat
readonly sampleMode : PostProcessStageSampleMode
readonly scissorRectangle : BoundingRectangle
BoundingRectangle。默认的边界矩形将禁用剪切测试。
In the fragment shader, use czm_selected to determine whether or not to apply the post-process
stage to that fragment. For example:
if (czm_selected(v_textureCoordinates)) {
// apply post-process stage
} else {
gl_FragColor = texture2D(colorTexture, v_textureCordinates);
}
The object property values can be either a constant or a function. The function will be called each frame before the post-process stage is executed.
A constant value can also be a URI to an image, a data URI, or an HTML element that can be used as a texture, such as HTMLImageElement or HTMLCanvasElement.
If this post-process stage is part of a PostProcessStageComposite that does not execute in series, the constant value can also be
the name of another stage in a composite. This will set the uniform to the output texture the stage with that name.
Methods
Once an object is destroyed, it should not be used; calling any function other than
isDestroyed will result in a DeveloperError exception. Therefore,
assign the return value (undefined) to the object as done in the example.
Throws:
-
DeveloperError ：此对象已销毁，即调用destroy（）。
If this object was destroyed, it should not be used; calling any function other than
isDestroyed will result in a DeveloperError exception.
Returns:
true；否则为false。