Function frustum

frustum(left, right, bottom, top, near, far, dst?): Mat4
Computes a 4-by-4 perspective transformation matrix given the left, right, top, bottom, near and far clipping planes. The arguments define a frustum extending in the negative z direction. The arguments near and far are the distances to the near and far clipping planes. Note that near and far are not z coordinates, but rather they are distances along the negative z-axis. The matrix generated sends the viewing frustum to the unit box. We assume a unit box extending from -1 to 1 in the x and y dimensions and from 0 to 1 in the z dimension.
Parameters
- left: number
  
  The x coordinate of the left plane of the box.
- right: number
  
  The x coordinate of the right plane of the box.
- bottom: number
  
  The y coordinate of the bottom plane of the box.
- top: number
  
  The y coordinate of the right plane of the box.
- near: number
  
  The negative z coordinate of the near plane of the box.
- far: number
  
  The negative z coordinate of the far plane of the box.
- Optional dst: Mat4
  
  Output matrix. If not passed a new one is created.
Returns Mat4
The perspective projection matrix.

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