CODEWITHSUNDEEP
openglmathtrigonometry
Martin Spasov
Martin Spasov

Reputation: 313

Pitch, Yaw, Roll calculation confusion

I am reading the this tutorial and I got a bit confused. Why is the x value changing with the pitch when the pitch is a rotation about the x axis.

direction.x = cos(glm::radians(pitch)) * cos(glm::radians(yaw));
direction.y = sin(glm::radians(pitch));
direction.z = cos(glm::radians(pitch)) * sin(glm::radians(yaw));

I get how the rest are changing, but not the cos(glm::radians(pitch)) in direction.x. How come this is the case ?

Upvotes: 0

Views: 1607

Answers (1)

riv
riv

Reputation: 7343

First of all, your pitch seems to rotate around Z, not X.

Second, Euler angles are applied sequentially, in this case Yaw is applied first, then Pitch. So as you noticed, yaw does not affect Y axis, as expected. But once it is applied, pitch rotates around the new Z axis, instead of the original one. If you set yaw=0, you will see that pitch no longer affects direction.z (since it is always 0).

Upvotes: 2

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