Uniform Types

Each uniform must have a `value` property. The type of the value must correspond to the type of the uniform variable in the GLSL code as specified for the primitive GLSL types in the table below. Uniform structures and arrays are also supported. GLSL arrays of primitive type must either be specified as an array of the corresponding THREE objects or as a flat array containing the data of all the objects. In other words; GLSL primitives in arrays must not be represented by arrays. This rule does not apply transitively. An array of `vec2` arrays, each with a length of five vectors, must be an array of arrays, of either five `Vector2` objects or ten `number`s.

GLSL type	JavaScript type
int	Number
uint	Number
float	Number
bool	Boolean
bool	Number
vec2	Vector2
vec2	Float32Array (*)
vec2	Array (*)
vec3	Vector3
vec3	Color
vec3	Float32Array (*)
vec3	Array (*)
vec4	Vector4
vec4	Quaternion
vec4	Float32Array (*)
vec4	Array (*)
mat2	Float32Array (*)
mat2	Array (*)
mat3	Matrix3
mat3	Float32Array (*)
mat3	Array (*)
mat4	Matrix4
mat4	Float32Array (*)
mat4	Array (*)
ivec2, bvec2	Float32Array (*)
ivec2, bvec2	Array (*)
ivec3, bvec3	Int32Array (*)
ivec3, bvec3	Array (*)
ivec4, bvec4	Int32Array (*)
ivec4, bvec4	Array (*)
sampler2D	Texture
samplerCube	CubeTexture

(*) Same for an (innermost) array (dimension) of the same GLSL type, containing the components of all vectors or matrices in the array.

Structured Uniforms

Sometimes you want to organize uniforms as `structs` in your shader code. The following style must be used so `three.js` is able to process structured uniform data.

uniforms = {
  data: { 
    value: {
      position: new Vector3(), 
      direction: new Vector3( 0, 0, 1 ) 
    } 
  } 
};

This definition can be mapped on the following GLSL code:

struct Data { 
  vec3 position;
  vec3 direction;
};
uniform Data data;

Structured Uniforms with Arrays

It's also possible to manage `structs` in arrays. The syntax for this use case looks like so:

const entry1 = {
  position: new Vector3(),
  direction: new Vector3( 0, 0, 1 )
};
const entry2 = {
  position: new Vector3( 1, 1, 1 ),
  direction: new Vector3( 0, 1, 0 )
};

uniforms = {
  data: {
    value: [ entry1, entry2 ]
  }
};

This definition can be mapped on the following GLSL code:

struct Data { 
  vec3 position; 
  vec3 direction; 
};
uniform Data data[ 2 ];