opengl中的旋转、平移、缩放矩阵生成函数

构建并返回平移矩阵 

mat4 buildTranslate(float x, float y, float z)
{ mat4 trans = mat4(1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, x, y, z, 1.0 ); return trans;
} 

构建并返回绕x轴的旋转矩阵 

mat4 buildRotateX(float rad)
{ mat4 xrot = mat4(1.0, 0.0, 0.0, 0.0, 0.0, cos(rad), -sin(rad), 0.0, 0.0, sin(rad), cos(rad), 0.0, 0.0, 0.0, 0.0, 1.0 ); return xrot;
}

构建并返回绕y轴的旋转矩阵 

mat4 buildRotateY(float rad)
{ mat4 yrot = mat4(cos(rad), 0.0, sin(rad), 0.0, 0.0, 1.0, 0.0, 0.0, -sin(rad), 0.0, cos(rad), 0.0, 0.0, 0.0, 0.0, 1.0 ); return yrot;
}

构建并返回绕z轴的旋转矩阵 

mat4 buildRotateZ(float rad)
{ mat4 zrot = mat4(cos(rad), -sin(rad), 0.0, 0.0, sin(rad), cos(rad), 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0 ); return zrot;
}

 

构建并返回缩放矩阵 

mat4 buildScale(float x, float y, float z)
{ mat4 scale = mat4(x, 0.0, 0.0, 0.0, 0.0, y, 0.0, 0.0, 0.0, 0.0, z, 0.0, 0.0, 0.0, 0.0, 1.0 ); return scale;
}

小结