Quaternion to Matrix using glm

Question

I am trying to convert quat in glm to mat4.

My code is :

#include <iostream>
#include<glm/glm.hpp>
#include<glm/gtc/quaternion.hpp>
#include<glm/common.hpp>
using namespace std;


int main()
{
    glm::mat4 MyMatrix=glm::mat4();
    glm::quat myQuat;

    myQuat=glm::quat(0.707107,0.707107,0.00,0.000);
    glm::mat4 RotationMatrix = quaternion::toMat4(myQuat);

    for(int i=0;i<4;++i)
    {
        for(int j=0;j<4;++j)
        {
            cout<<RotationMatrix[i][j]<<" ";
        }
        cout<<"\n";
    }
    return 0;
}

When i run the program it shows the error "error: ‘quaternion’ has not been declared".

Can anyone help me with this?

Solution 1

Add the include:

#include <glm/gtx/quaternion.hpp>

And fix the namespace of toMat4:

glm::mat4 RotationMatrix = glm::toMat4(myQuat);

glm::toMat4() exists in the gtx/quaternion.hpp file, which you can see only has the glm namespace.

---

Also as a side note, as of C++14, nested namespaces (e.g. glm::quaternion::toMat4) are not allowed.

Solution 2

In addition to meepzh's answer, it can also be done like this:

glm::mat4 RotationMatrix = glm::mat4_cast(myQuat);

which does not require #include <glm/gtx/quaternion.hpp>

Comments

[scry]

Nested namespace definitions are not allowed in C++14, but there are none defined in the question... anyway, they are allowed in C++17.

[meepzh]

It was mentioned in the comments, but in hindsight I should have responded there.

[user3882729]

On Fedora-32 desktop (Linux) it does require the above include.