问题
Currently using VC++ 11 with SDL2, GLM, and GLEW. The issue is stemming from GLM when I attempt to do two things: Create a rotation matrix, create a perspective camera matrix (3D).
The error is: "GLM: perspective function taking degrees as a parameter is deprecated" despite the fact that I am passing radians (as floats) to both functions. It says I should define something like "#define GLM_FORCE_RADIANS." Is that really necessary?
Personally I use degrees for everything, but OpenGL, so having to convert back and forth (for AI movement and what not) is a pain and actually causes a spike in CPU when I have many NPCs moving.
回答1:
#define degreesToRadians(x) x*(3.141592f/180.0f)
the static part should be resolved at compile time by the compiler, just surround any degrees to glm stuff with that macro and you are done. Also add
#define GLM_FORCE_RADIANS
before including and glm headers, so that it will by default use radians instead of degrees
回答2:
Instead of manual transformation you can use
glm::radians(degrees) // from degrees to radians.
Or
glm::degrees(radians) // from radians to degrees.
For further information about glm's trigonometry functions consult this page: http://glm.g-truc.net/0.9.4/api/a00136.html#ga4fb76e28851c9ff6653532566084e091
来源：https://stackoverflow.com/questions/23945139/glm-function-taking-degrees-as-a-parameter-is-deprecated-when-using-radians