Parent actor's rotation does not apply to children, but does apply to grandchildren #7

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opened 2022-01-04 21:05:40 +00:00 by keith · 2 comments

keith commented

2022-01-04 21:05:40 +00:00

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For some reason, the position of the child-actor in (wh-engine:register-test-scene) is not affected by the rotation of its parent, but the position of grandchild-actor is affected by test-actor-2's rotation. I'm not sure if this applies just to rendering or to all transformation-related calculations, but I think the bug is in one or more of these:

the actor's local-to-parent transformation matrix
computation of the actor's world-matrix
opengl-matrix conversion

(ac990359cb is the commit that revealed the full weirdness of this bug, but rotation was never being applied properly to the child-actor's location.)

For some reason, the position of the `child-actor` in `(wh-engine:register-test-scene)` is not affected by the rotation of its parent, but the position of `grandchild-actor` *is* affected by `test-actor-2`'s rotation. I'm not sure if this applies just to rendering or to all transformation-related calculations, but I think the bug is in one or more of these: - the actor's local-to-parent transformation matrix - computation of the actor's world-matrix - opengl-matrix conversion (ac990359cb is the commit that revealed the full weirdness of this bug, but rotation was never being applied properly to the `child-actor`'s location.)