39 lines
991 B
C++
39 lines
991 B
C++
#include<glm/glm.hpp>
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#include<glm/gtx/quaternion.hpp>
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#include<iostream>
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void PrintMatrix(const char *name,const glm::mat4 &m)
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{
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std::cout<<"Matrix:"<<name<<"\n";
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for(int i=0;i<4;i++)
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{
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for(int j=0;j<4;j++)
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std::cout<<m[i][j]<<" ";
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std::cout<<"\n";
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}
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std::cout<<"\n";
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}
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int main(int,char **)
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{
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const glm::vec3 rotate_axis(0.0f,1.0f,0.0f); // Y-axis
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const float rotate_radians=glm::radians(90.0f);
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glm::quat q =glm::angleAxis(rotate_radians,rotate_axis);
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glm::mat4 m1=glm::toMat4(q);
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glm::mat4 m2=glm::rotate(glm::mat4(1.0f),rotate_radians,rotate_axis);
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float cos90=glm::cos(rotate_radians);
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float acos90_1=glm::acos(cos90);
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float acos90_2=glm::acos(5.96046e-08);
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//m1方法结果是5.96046e-08
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//m2方法结果是-4.37114e-08
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//但其实它们结果是一样的，都是近似于0的数值。
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PrintMatrix("From Quaternion",m1);
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PrintMatrix("From Rotate",m2);
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return 0;
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} |