normal() / Reference / Processing.org

Name

normal()

Description

Sets the current normal vector. Used for drawing three-dimensional shapes and surfaces, normal() specifies a vector perpendicular to a shape's surface which, in turn, determines how lighting affects it. Processing attempts to automatically assign normals to shapes, but since that's imperfect, this is a better option when you want more control. This function is identical to glNormal3f() in OpenGL.

Examples

```
size(400, 400, P3D);
noStroke();
background(0);
pointLight(150, 250, 150, 40, 120, 200);
beginShape();
normal(0, 0, 4);
vertex(80, 80, -40);
vertex(320, 80, 40);
vertex(320, 320, -40);
vertex(80, 320, 40);
endShape(CLOSE);
```