Multiplying a Matrix and a Vector in Glm (Opengl)
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 Be Able to Do...
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 be able to do something like this:
glm::mat4 m(1.0);
glm::vec4 v(1.0);
glm::vec4 result = v * m;
This doesn't seem to work, though. What is the correct way to do this kind of operation in GLM?
Edit:
Just a note to anyone who runs into a similar problem. GLM requires all operands to use the same type. Don't try multiplying a dvec4 with a mat4 and expect it to work, you need a vec4.
glm::vec4 is represented as a column vector. Therefore, the proper form is:
glm::vec4 result = m * v;(note the order of the operands)
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).
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