构建并返回平移矩阵
cpp
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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
cpp
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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
cpp
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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
cpp
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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
cpp
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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