C++ 在 GLM (OpenGL) 中乘以矩阵和向量
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Multiplying a matrix and a vector in GLM (OpenGL)
提问by extropic-engine
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:
我有一个变换矩阵m和一个向量v。我想使用矩阵对向量进行线性变换。我希望我能够做这样的事情：
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?
不过，这似乎行不通。在 GLM 中进行此类操作的正确方法是什么？
Edit:
编辑：
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 dvec4with a mat4and expect it to work, you need a vec4.
只是对遇到类似问题的任何人的说明。GLM 要求所有操作数使用相同的类型。不要尝试将 advec4与 a相乘mat4并期望它起作用，您需要一个vec4.
回答by andand
glm::vec4is represented as a column vector. Therefore, the proper form is:
glm::vec4表示为列向量。因此，正确的形式是：
glm::vec4 result = m * v;(note the order of the operands)
（注意操作数的顺序）
回答by Nicol Bolas
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.
由于 GLM 旨在模仿 GLSL 并且旨在与 OpenGL 一起使用，因此其矩阵是列优先的。如果你有一个列主矩阵，你可以将它与向量左乘。
Just as you should be doing in GLSL (unless you transposed the matrix on upload).
就像您在 GLSL 中应该做的一样（除非您在上传时转置了矩阵）。
