[Bf-committers] Make Parent - shouldn't it work differently?

[Bassam Kurdali]

I don't think it should happen by default. it could be especially nasty
for animation data, linked data, etc. Also it doesn't store as much
information (the relationship between child and parent at the time of
parenting) which could come in handy later. However, it is not hard to
do!

You need for that is to multiply the inverse transform matrix with the
world transform matrix. I think - I may have gotten the order wrong.
so, an easy way :
1- do a normal parent operator (creates inverse transform matrix)
2- multiply the inverse transform and the regular matrix for the object
3- clear inverse transform
4- put the matrix from 2 into the transform for the object.

I think 4 is a bit more complicated, because I *think* that the matrices
are read-only, so you'll have to decompose into
translation/rotation/scale (mathutils provides all those functions
anyway)
bundle that up into an operator and you're home free.
Another good option is just to calculate the inverse parent and avoid
doing the parent-clear inverse dance. If this is done in blender
internally the same code could be used to avoid having two code paths.

one possibility for blender behavior is to have a parent menu, with a
few choices, similar to the un-parent, and keep the current behavior the
top/default choice.

On Fri, 2012-09-21 at 21:11 +0200, Bartek Skorupa (priv) wrote:
> Thank you.
> However we are only half way there. It solves the major issue as we at least don't have weird properties of the child.
> The question still remains:
> How to make a parent such that the child stays at it's current location, rotation and scale, but the values of loc/rot/scale change.
> This is what should happen by default.
> 
> @Bassam Kurdali:
> You wrote:
> > the default behaviour should be kept, of course. Most users want this.
> 
> 
> I wouldn't agree with that. I'm scratching my head trying to figure out at least one benefit of current default behavior and can't find anything.
> Is there any good reason for destroying the order in the scene? Having objects with locations, rotations and scales set in relation to who-the-hell-knows what?
> What do I miss?
> 
> Bartek Skorupa
> 
> www.bartekskorupa.com
> 
> On 21 wrz 2012, at 20:44, Remigiusz Fiedler <migius at gmx.net> wrote:
> 
> > no ctrl needed, it is "alt p - clear inverse parent"
> > 
> > 2012/9/21 Bartek Skorupa (priv) <bartekskorupa at bartekskorupa.com>:
> >> Ctl-Alt-P ??????
> >> When I hit it I get a warning: "Can only make proxy for a referenced object or group"
> >> What do I miss?
> >> 
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