[Bf-committers] Drop to ground mod idea

Erwin Coumans erwin.coumans at gmail.com
Thu Dec 15 23:18:56 CET 2011

A good starting point seems to use Bullet for that.
Is there still a plan to integrate/merge Bullet in Blender (outside of BGE)?


On 15 December 2011 23:09, Campbell Barton <ideasman42 at gmail.com> wrote:

> On Tue, Dec 13, 2011 at 7:24 PM, Knapp <magick.crow at gmail.com> wrote:
> > I keep finding cases were I need a stack modifier that drops something
> > to the ground.
> > Examples of this are:
> >
> > A big group of trees that are in the dirt but the dirt is done with a
> > cloud texture into a displacement mod. Getting each tree to the right
> > place is a real pain. Then you adjust the cloud text and have to do it
> > all over again.
> >
> > A boat on dynamic or ocean sim water. How do you get it to float with
> > the waves in an animation? With ocean sim you don't even have an
> > animated mesh to parent to. Being able to drop a vert to the water
> > surface would be great. In the case of a big ship you might even want
> > to drop 4 points on the ship to the water surface and not just a point
> > of the surface but an average of the surface in an area under the
> > boat.
> >
> > A car driving over rough ground in a film. Also a real pain to do but
> > a drop to mesh surface would be great! Perhaps for each wheel.
> >
> > Mod options:
> > to surface or plane or coordinate like +100 X.
> > Surface as defined by a vert, surface point or an averaged area
> > Direction (a vector?) to fall.
> > Depth of penetration into surface.
> > What is doing the touching, IE a point from the object or an offset
> > from origin or the lowest surface etc.
> > Perhaps some way to make the 4 points of a car that touch change the
> > rotation of the object with possible locking of axis (plural form?).
> >
> > Possible problems is that it is heading into the direction of physics
> > and might need more data, for example over time, than is easy to
> > implement. Even with these limits I would find it useful even as a
> > simple drop to point along an axis but much better as drop to surface.
> >
> > I am sure something like this must exist for the BGE but I want it for
> > film and still picture making.
> >
> > I found this script.
> >
> http://wiki.blender.org/index.php/Extensions:2.5/Py/Scripts/Object/Drop_to_ground
> >
> > Is there anything else that I might have missed or another way to do
> this?
> >
> > --
> > Douglas E Knapp
> Hi, firstly I think we should have at least 1 tool for simple drop to
> group functionality (with some options for offset and orient to the
> grounds shape).
> Further this gets a bit tricky because there is not one right way to
> solve the problem, with how the tool functions (do you try to
> intersect the base of the object with the grounds surface for
> example), implementation too - could use objects/duplis/particles etc.
> As for animation, for this I think a separate tool is needed since for
> animation you get too many variables/issues
> * how to follow surface without jittering, to follow surface over one
> point or 4+ points on each corner of the object,
> * some option to smooth out motion or dampen it
> * a useful way to change speed
> * how to manage multiple objects (possibly even have them not run into
> eachother)
> * you may want other objects to match this speed - like wheels of a
> vehicle turning.
> If a developer doesn't have an immediate use case its a bit arbitrary
> as to which issues you try to solve and how much detail you go into.
> --
> - Campbell
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