Ask questions about image rotation

MetalRay

Using PlgBlt can make an image rotate on a plane. If you don't use directx or opengl, what method can you use to rotate an image in space? For example, using 6 pictures to paste into a cube, if I say the method of scanning and rotating point by point, I already know it, but the display is very slow. I don't know any quick way?

snowmanzf

I think you can still use PlgBlt. This function can also convert the image into parallel quadrilaterals. No matter how you turn a cube, you can see three faces at most, and each face is parallelogram. So you need to calculate the shape of each face, and then use PlgBlt to draw it up, but the image effect and DirectX may be inferior.

MetalRay

Ask how to calculate the shape of each face under different rotation angles? Can you give a simple example?