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?

Does `quaternion::toMat4` need to be `glm::quaternion::toMat4`? — NathanOliver, Jul 01 '16 at 12:09

meepzh · Accepted Answer · 2017-06-29T17:42:40.147

22

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.

edited Jun 29 '17 at 17:42

answered Jul 01 '16 at 18:06

meepzh

707
1
7
15

3

Nested namespace *definitions* are not allowed in C++14, but there are none defined in the question... anyway, they are allowed in C++17. – scry Sep 08 '18 at 18:07
It was mentioned in the comments, but in hindsight I should have responded there. – meepzh Apr 05 '20 at 11:51

score 13 · Answer 2 · answered Jul 16 '17 at 17:02

13

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>

answered Jul 16 '17 at 17:02

mchiasson

2,452
25
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On Fedora-32 desktop (Linux) it does require the above include. – user3882729 Jan 18 '22 at 15:16

Quaternion to Matrix using glm

2 Answers2