1、How to convert a 3D coordinate system into a corresponding 2D coordinate system based on camera's eye and target parameters？
I want to draw an arrow pointing to a certain point，And rotate along with the rotation
2、How to draw text on the canvas?
I just want to achieve the effect shown in the above image
1、How to convert a 3D coordinate system into a corresponding 2D coordinate system based on camera's eye and target parameters？ I want to draw an arrow pointing to a certain point，And rotate along with the rotation 2、How to draw text on the canvas?
I just want to achieve the effect shown in the above image