Outputs the product (multiplication) of the input vector by the specified matrix. The multiplication is performed as if the vector is a row-vector on the left and the matrix is on the right.
Multiplying a 3D vector with a 4x4 matrix outputs a 3D vector. To accomplish this, the value 1 is added as the fourth component of a new 4D vector, then the multiplication is performed. Finally, the components of the resulting 4D vector are divided by its fourth component to produce the resulting 3D vector.
Multiplying a 4D vector with an 3x3 matrix outputs an 4D vector. To accomplish this, a new row/column is added as the fourth row/column of a new 4x4 matrix, each new component being set to 0 except the last one (the component of the fourth row/column) being set to 1. The multiplication is then performed to produce the resulting 4D vector.
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