CODEWITHSUNDEEP
javascriptthree.js
Nicolas S.Xu
Nicolas S.Xu

Reputation: 14534

What is the list of key word attribute in InstancedBufferGeometry?

For the buffer geometry example here, if I change position to position1, it does not work at all. 

var geometry = new THREE.BufferGeometry();
// create a simple square shape. We duplicate the top left and bottom right
// vertices because each vertex needs to appear once per triangle.
var vertices = new Float32Array( [
    -1.0, -1.0,  1.0,
     1.0, -1.0,  1.0,
     1.0,  1.0,  1.0,

     1.0,  1.0,  1.0,
    -1.0,  1.0,  1.0,
    -1.0, -1.0,  1.0
] );

// itemSize = 3 because there are 3 values (components) per vertex
geometry.setAttribute( 'position', new THREE.BufferAttribute( vertices, 3 ) );
// I can't change the string 'position' to 'position1', why? 

var material = new THREE.MeshBasicMaterial( { color: 0xff0000 } );
var mesh = new THREE.Mesh( geometry, material );

Clearly, 'position' is the keyword that is used internally for a list of vertexes. I assume the position will be passed to vertex shader, is this correct?

What are the list of keyword for InstancedBufferGeometry, like the 'position'?

Upvotes: 1

Views: 40

Answers (1)

Rabbid76
Rabbid76

Reputation: 210968

See WebGLProgram. Built-in attributes are:

attribute vec3 position;
attribute vec3 normal;
attribute vec2 uv;

Which are the vertex coordinate, normal vector and texture coordinate (There are further attributes for morphing and skinning).

If you use a ShaderMaterial, then you can use Your own vertex and fragment shader, custom attributes and use any name you want.

Upvotes: 1

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