Fix #103571: Force field absorption for rigid bodies #106503

Lukas Tönne · 2023-04-03T17:53:16+02:00

Lukas Tönne commented

2023-04-03 17:53:16 +02:00

Force field absorption allows dampening of force fields by colliders, but it does not currently work when the scene only contains a rigid body simulation. It requires a particle simulation, cloth, dynamic paint, fluid sim, or softbodies for the feature to work correctly.

The reasons is that the effector function computing force field strength uses depsgraph relations to determine which colliders "absorb" the force field. If there are no dependencies between colliders and effectors registered in the depsgraph, the visibility function eff_calc_visibility does not add any absorption.

There is a function build_collision_relations which adds a dependency between the absorption object (the one with a collision modifier) and the forcefield object. It's currently only called by

Particle systems (DepsgraphRelationBuilder::add_particle_collision_relations)
Cloth, DynPaint, Fluid, and Softbody (DEG_add_collision_relations and indirectly through DEG_add_forcefield_relations).

The DepsgraphRelationsBuilder now adds the effector relations also when building rigid body relations.

Force field absorption allows dampening of force fields by colliders, but it does not currently work when the scene only contains a rigid body simulation. It requires a particle simulation, cloth, dynamic paint, fluid sim, or softbodies for the feature to work correctly. The reasons is that the effector function computing force field strength uses depsgraph relations to determine which colliders "absorb" the force field. If there are no dependencies between colliders and effectors registered in the depsgraph, the visibility function `eff_calc_visibility` does not add any absorption. There is a function build_collision_relations which adds a dependency between the absorption object (the one with a collision modifier) and the forcefield object. It's currently only called by 1. Particle systems (DepsgraphRelationBuilder::add_particle_collision_relations) 2. Cloth, DynPaint, Fluid, and Softbody (DEG_add_collision_relations and indirectly through DEG_add_forcefield_relations). The `DepsgraphRelationsBuilder` now adds the effector relations also when building rigid body relations.

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Lukas Tönne added the

Module

Nodes & Physics

label 2023-04-03 17:53:16 +02:00

Hans Goudey was assigned by Lukas Tönne

2023-04-03 17:53:17 +02:00

Lukas Tönne added 1 commit 2023-04-03 17:53:30 +02:00

d400f2143a Fix #103571 : Force field absorption for rigid bodies.

Hans Goudey removed their assignment 2023-04-03 18:01:40 +02:00

Hans Goudey requested review from Hans Goudey 2023-04-03 18:02:35 +02:00

Hans Goudey changed title from ~~Fix #103571: Force field absorption for rigid bodies.~~ to Fix #103571: Force field absorption for rigid bodies

2023-04-03 20:53:50 +02:00

Lukas Tönne added 1 commit 2023-04-04 10:41:50 +02:00

04f5a7824f Revert unrelated cleanup.

Lukas Tönne commented

2023-04-06 14:48:29 +02:00

@Sergey approved, i'm going to complete this one.

Lukas Tönne merged commit 7d8740f06d into main

2023-04-06 14:49:17 +02:00

Lukas Tönne deleted branch fix-rigid-body-force-field-absorption

2023-04-06 14:49:18 +02:00

Lukas Tönne referenced this issue from a commit

2023-04-06 14:49:19 +02:00

Fix #103571: Force field absorption for rigid bodies

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Fix #103571: Force field absorption for rigid bodies #106503