如何在3D中围绕相同的轴心/点旋转多个对象？

Question

Here is the rotation code when initialising the model matrix:

_model =    translate(_position) *
                    (   rotate(_rotation.data[0], 1.0f, 0.0f, 0.0f) * 
                        rotate(_rotation.data[1], 0.0f, 1.0f, 0.0f) * 
                        rotate(_rotation.data[2], 0.0f, 0.0f, 1.0f)) *
                    scale(_scale);

Basically, I have got a 3D level and I want to rotate the level and all the objects in it around the same pivot point.

How could I do this?

Answer 1

This is typically done by the concatenation (ie multiplication) of three matrices:

1. T : Translate the desired pivot to the origin (0, 0, 0).
2. R : Apply the rotation.
3. Tinv : Translate back.

Because of the way OpenGL matrices are structured, the right order is Tinv * R * T . Premultiply your view matrix by that.