How to implement the Roll angle together with Yaw and Pitch in glm::lookAt function?

Question

From this page https://learnopengl.com/Getting-started/Camera I learned how to implement the Yaw and Pitch angle to a glm::lookAt function. But sadly I could not find any reference of how to add also the Roll angle to the funcion.

When I try to implement it, the x and z axis keep constant, and don't adapt to the Roll rotation.

[tag:glm] != [tag:glm-math] – Rabbid76 Nov 22 '20 at 12:23 — Rabbid76, Nov 22 '20 at 12:23
The "roll" angle is defined by the up vector. – Rabbid76 Nov 22 '20 at 12:23 — Rabbid76, Nov 22 '20 at 12:23

score 1 · Answer 1 · answered Nov 23 '20 at 23:07

First make sure you really need to use roll for camera movement, as it's uncommon unless you are making a camera that follows something that flies. You change roll by rotating the up vector about the front vector (which will be unchanged), so it should look something like

up.y = up.y * cos(rollAngle)
up.x = ...
up.z = ...

where x and z will have 2 terms, depending on x and z of the front vector, similar to how the tutorial calculated the front vector depended on yaw and pitch You might want to consider a linear algebra library like Eigen as it will take care of rotations and other things you will probably need pretty easily using their Transform api.

Could you elaborate on how to calculate x and z? – kmecpp Apr 09 '21 at 02:25 — kmecpp, Apr 09 '21 at 02:25

How to implement the Roll angle together with Yaw and Pitch in glm::lookAt function?

1 Answers1