Multiplying a matrix and a vector in GLM (OpenGL)

Question

I have a transformation matrix, m, and a vector, v. I want to do a linear transformation on the vector using the matrix. I\'d expect that I would b

Answer 1

Since GLM is designed to mimic GLSL and is designed to work with OpenGL, its matrices are column-major. And if you have a column-major matrix, you left-multiply it with the vector.

Just as you should be doing in GLSL (unless you transposed the matrix on upload).

Answer 2

glm::vec4 is represented as a column vector. Therefore, the proper form is:

glm::vec4 result = m * v;

(note the order of the operands)