Understanding the Order of Transformations in 3D Graphics

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Комментарии
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Nice video!!! But just in case anyone found themselves in the same situation i was:

The thing is glm::rotate does something different from what I personally think is intuitive.
When doing:
mMat = identityMatrix
mMat = glm::rotate(mMat, angle, axis)
The function returns a matrix which is the result of multiplying two matrices, the rotation you want ON THE RIGHT and the translation ON THE LEFT (mMat * rawRotation) so that results in first rotating a point over its origin and then translating, so we don't have translation, just rotation.

In order to make a rotation in glm we should make something like:
mMat = identityMatrix
mMat = glm::rotate(identity, angle, axis) * mMat
That way we first translate the point and then rotate it, and we get an orbit around the origin.

alaro
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Very big thank you! You made things very clear.

kamalmoustafa
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Thank you so much for the video, I think your explanation is clear and concise :), also, I didnt expect my post would lead to a video, haha.

kirikiri-san
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Hi, great videos. How do you render the axis lines along with the cubes in this video?

userrand