Parameter QML Type

Provides storage for a name and value pair. This maps to a shader uniform. 更多...

导入语句：	import Qt3D.Render 2.12
实例化：	QParameter

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特性

name : QString
value : QVariant

详细描述

A Parameter can be referenced by a RenderPass , Technique, Effect, Material, TechniqueFilter , RenderPassFilter . At runtime, depending on which shader is selected for a given step of the rendering, the value contained in a Parameter will be converted and uploaded if the shader contains a uniform with a name matching that of the Parameter.

Parameter {
    name: "diffuseColor"
    value: "blue"
}
// Works with the following GLSL uniform shader declarations
// uniform vec4 diffuseColor;
// uniform vec3 diffuseColor;
// uniform vec2 diffuseColor;
// uniform float diffuseColor;

注意： some care must be taken to ensure the value wrapped by a Parameter can actually be converted to what the real uniform expect. Giving a value stored as an int where the actual shader uniform is of type float could result in undefined behaviors.

注意： when the targeted uniform is an array, the name should be the name of the uniform with [0] appended to it.

Parameter {
    name: "diffuseValues[0]"
    value: [0.0, 1.0. 2.0, 3.0, 4.0, 883.0, 1340.0, 1584.0]
}
// Matching GLSL shader uniform  declaration
// uniform float diffuseValues[8];

When it comes to texture support, the Parameter value should be set to the appropriate texture subclass that matches the sampler type of the shader uniform.

Parameter {
    name: "diffuseTexture"
    value: Texture2D { ... }
}
// Works with the following GLSL uniform shader declaration
// uniform sampler2D diffuseTexture

另请参阅 Qt3DRender::QAbstractTexture .

特性文档编制

name : QString

Specifies the name of the parameter

value : QVariant

Specifies the value of the parameter