reimplement look_at#3144
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This PR re-implements the look_at feature, which has been broken for many years. A look-at rotation is a type of intrinsic_rotation, just like dumb-rotations. The same code handles both; the only difference is whether submodel_rotate or submodel_look_at is called to apply the actual movement. The previous look_at parsing code has been optimized by performing the name-to-submodel resolution when the model is actually parsed, instead of when the first look-at rotation is called. This avoids the need to store a name in the submodel struct and also avoids cluttering the look_at function. This PR is essentially bookkeeping, except for the submodel_look_at method. This method takes advantage of the submodel rotation upgrade and calculates angles in almost the same way as the new turret rotation code. It's much more elegant, much less hackish, and works for all detail levels.
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Baezon
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LGTM, only one very minor comment, that really isn't an issue or anything.
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This PR re-implements the look_at feature, which has been broken for many years. A look-at rotation is a type of intrinsic_rotation, just like dumb-rotations. The same code handles both; the only difference is whether submodel_rotate or submodel_look_at is called to apply the actual movement.
The previous look_at parsing code has been optimized by performing the name-to-submodel resolution when the model is actually parsed, instead of when the first look-at rotation is called. This avoids the need to store a name in the submodel struct and also avoids cluttering the look_at function.
This PR is essentially bookkeeping, except for the submodel_look_at method. This method takes advantage of the submodel rotation upgrade and calculates angles in almost the same way as the new turret rotation code. It's much more elegant, much less hackish, and works for all detail levels.
This PR depends on #3056 and will remain in draft status until that is merged.