OpenGLContext.utilities

Simple utility functions that should really be in a C module

Functions

combineNormals( normals , weights = None )

Given set of N normals, return (weighted) combination

coplanar( points )

Determine if points are coplanar

All sets of points < 4 are coplanar Otherwise, take the first two points and create vector for all other points, take vector to second point, calculate cross-product where the cross-product is non-zero (not colinear), if the normalised cross-product is all equal, the points are collinear...

crossProduct( first , second )

Given 2 4-item vectors, return the cross product as a 4-item vector

magnitude( vector )

Given a 3 or 4-item vector, return the vector's magnitude

normalise( vector )

Given a 3 or 4-item vector, return a 3-item unit vector

plane2PointNormal( abcd )

Get a point and normal from a plane equation

pointNormal2Plane( point , normal )

Create parametric equation of plane from point and normal

rotMatrix( xyza )

Given rotation as x,y,z,a (a in radians), return rotation matrix

Returns a 4x4 rotation matrix for the given rotation, the matrix is a Numeric Python array.

x,y,z should be a unit vector.