Is there a way to set a fixed value for properties in Three.js?

I am on the hunt for the equivalent in Three.js to vertexAttrib. My goal is to assign a fixed value to my shader attribute.

Answer №1

One way to achieve this is by utilizing the Material.defaultAttributeValues property. This object consists of key-value pairs, where the key represents the attribute name and the value denotes the constant attribute value. For instance, if you wish to set a constant vertex color, you can follow this approach:

var material = new THREE.MeshBasicMaterial( { vertexColors: THREE.VertexColors } );
material.defaultAttributeValues = {
    color: [ 0, 0, 1 ] // blue
};

It is crucial to steer clear of defining a buffer attribute with the same name to ensure that the values from defaultAttributeValues are utilized instead of the geometry data.

View the complete demo

If a property remains constant across all vertices, it is advisable to use uniforms. In the case presented above, a preferable option would be to define Material.color.

three.js R106

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