世界空間到陰影貼圖空間
float scale = 1f / split; m.m00 = (0.5f * (m.m00 + m.m30) + offset.x * m.m30) * scale; m.m01 = (0.5f * (m.m01 + m.m31) + offset.x * m.m31) * scale; m.m02 = (0.5f * (m.m02 + m.m32) + offset.x * m.m32) * scale; m.m03 = (0.5f * (m.m03 + m.m33) + offset.x * m.m33) * scale; m.m10 = (0.5f * (m.m10 + m.m30) + offset.y * m.m30) * scale; m.m11 = (0.5f * (m.m11 + m.m31) + offset.y * m.m31) * scale; m.m12 = (0.5f * (m.m12 + m.m32) + offset.y * m.m32) * scale; m.m13 = (0.5f * (m.m13 + m.m33) + offset.y * m.m33) * scale;