gltfutils.py 文件源码

def calc_projection_matrix(camera):
    if 'perspective' in camera:
        f = 1 / np.tan(camera['perspective']['yfov'] / 2)
        znear, zfar = camera['perspective']['znear'], camera['perspective']['zfar']
        projection_matrix = np.array([[f / camera['perspective']['aspectRatio'], 0, 0, 0],
                                      [0, f, 0, 0],
                                      [0, 0, (znear + zfar) / (znear - zfar), 2 * znear * zfar / (znear - zfar)],
                                      [0, 0, -1, 0]], dtype=np.float32)
    elif 'orthographic' in camera:
        raise Exception('TODO')
    return projection_matrix