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Fernando Alcala (TriFractal)
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Jul 8 2020, 8:54 PM (34 w, 1 d)

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Yesterday

Fernando Alcala (TriFractal) added a comment to T85212: Increasing timesteps in Mantaflow causes chaotic results.

Forgot to do liquids. APIC. By the way, version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: rB02948a2cab44

Thu, Mar 4, 8:28 AM · Nodes & Physics, BF Blender

Wed, Mar 3

Fernando Alcala (TriFractal) added a comment to T85212: Increasing timesteps in Mantaflow causes chaotic results.

Create two cubes. The domain is 25cm25cm50cm at 0X 0Y 15cmZ and the cube is 10cm10cm10cm at 0X 0Y 0Z. Everything is default expect for the timestepping.

Wed, Mar 3, 8:45 PM · Nodes & Physics, BF Blender
Fernando Alcala (TriFractal) added a comment to T85212: Increasing timesteps in Mantaflow causes chaotic results.

Can't believe I didn't think of this. Here are some tests of 2400 fps simulations with no timestepping, the temporal equivalence of 24 fps and 100 timestepping.
Smoke, 64 domain, 2400fps edited to real-time. Looks exactly like 24fps with 100 timestepping:

Wed, Mar 3, 8:27 AM · Nodes & Physics, BF Blender

Fri, Feb 26

Fernando Alcala (TriFractal) added a comment to T85932: Compund_Collision_chain demo not working properly .

D5797#237065 comment section?

Fri, Feb 26, 7:40 PM · Nodes & Physics, BF Blender

Thu, Feb 25

Fernando Alcala (TriFractal) added a comment to T85932: Compund_Collision_chain demo not working properly .

David's original scene Comptest Chain.blend (6mb) used three separate cubes each with a convex hull. This one works.


Then Dalai did some "cleanup" compound_collision_chain.blend (777kb) and merged those cubes, creating a concave shape that still has convex hull. This is what you download off of Blender. Doesn't work.

David then fixes this compound_collision_chain.blend (253kb) by separating the bottom cube and removing the rigid bodies from the wall.

Thu, Feb 25, 10:38 PM · Nodes & Physics, BF Blender

Mon, Feb 22

Fernando Alcala (TriFractal) closed T84001: Mantaflow Initial velocity not working PROPERLY as Invalid.

It's a limitation.

Mon, Feb 22, 8:50 AM · Nodes & Physics, BF Blender

Tue, Feb 9

Fernando Alcala (TriFractal) added a comment to T84001: Mantaflow Initial velocity not working PROPERLY.

The "issue" that I had was that the size of the simulation was too small for the timestep size. Normal 50 in meter sized sims works fine:

Tue, Feb 9, 11:04 PM · Nodes & Physics, BF Blender

Jan 29 2021

Fernando Alcala (TriFractal) added a project to T85212: Increasing timesteps in Mantaflow causes chaotic results: Nodes & Physics.
Jan 29 2021, 8:44 PM · Nodes & Physics, BF Blender
Fernando Alcala (TriFractal) created T85212: Increasing timesteps in Mantaflow causes chaotic results.
Jan 29 2021, 8:44 PM · Nodes & Physics, BF Blender

Jan 7 2021

Fernando Alcala (TriFractal) added a comment to T82817: Cloth+RigidBody limitation.

I found the issue. Collision sources Final and Deform don't work (as expected) but Base does.

Jan 7 2021, 1:14 AM · Nodes & Physics, BF Blender

Dec 30 2020

Fernando Alcala (TriFractal) added a comment to T84001: Mantaflow Initial velocity not working PROPERLY.

With respect to particles, initial velocity source does change the simulation, but at an imperceptible level compared to using meshes.

Dec 30 2020, 12:10 AM · Nodes & Physics, BF Blender

Dec 28 2020

Fernando Alcala (TriFractal) closed T84130: Strange outcome of liquid simulation as Invalid.

It's called narrow band


Dec 28 2020, 6:30 AM · Nodes & Physics, BF Blender

Dec 23 2020

Fernando Alcala (TriFractal) added a comment to T84001: Mantaflow Initial velocity not working PROPERLY.

Here I compare between 0 and 100 (max) for the initial velocity. There's very little difference in using the maximum value.

Dec 23 2020, 6:52 AM · Nodes & Physics, BF Blender
Fernando Alcala (TriFractal) added a comment to T83679: Cloth collision with rigidbody object doesn't work.

version: 2.92.0 Alpha, branch: master, commit date: 2020-12-20 17:48, hash: d283a093d664

Dec 23 2020, 12:39 AM · Nodes & Physics, BF Blender

Dec 17 2020

Fernando Alcala (TriFractal) closed T83798: Clothes colliding with another does not work correctly. as Resolved.
Dec 17 2020, 10:01 AM · Nodes & Physics, BF Blender
Fernando Alcala (TriFractal) added a comment to T83798: Clothes colliding with another does not work correctly..

Turn "Single Sided" off in the collision settings

Dec 17 2020, 12:19 AM · Nodes & Physics, BF Blender

Dec 15 2020

Fernando Alcala (TriFractal) added a comment to T83594: Rigid Body and Cloth simulations are indeterministic and borderline unusable in production.

Blender's rigid body documentation is useless. But when you learn how to use it:

Dec 15 2020, 1:25 AM · BF Blender

Nov 5 2020

Fernando Alcala (TriFractal) added a comment to T82280: Quick Smoke Doesn't Work In Already Established Scene.

I had no issues

Nov 5 2020, 4:28 AM · Nodes & Physics, BF Blender

Oct 27 2020

Fernando Alcala (TriFractal) added a comment to T82126: Unexpected explosion on pieces of a fractured cube (Added Rigid Body).

You are doing something wrong, I ran into no issues.

Oct 27 2020, 7:46 PM · Nodes & Physics, BF Blender

Sep 9 2020

Fernando Alcala (TriFractal) closed T79764: Rigid body primitive capsule is broken as Resolved.

The September 7 dev notes mentioned an update to the Bullet library. I downloaded b351607996e4 and the issue wasn't there. Every primitive can be used now! The last thing to make rigid bodies perfect is resolving the need to enable a collision margin of 0m to fix some interactions, but I can wait for that.

Sep 9 2020, 9:06 AM · Nodes & Physics, BF Blender

Aug 15 2020

Fernando Alcala (TriFractal) updated the task description for T79764: Rigid body primitive capsule is broken.
Aug 15 2020, 2:05 AM · Nodes & Physics, BF Blender
Fernando Alcala (TriFractal) added a comment to T79764: Rigid body primitive capsule is broken.

Should have added that in the instructions, capsules push each other slightly while other primitives don't.

Aug 15 2020, 2:02 AM · Nodes & Physics, BF Blender

Aug 14 2020

Fernando Alcala (TriFractal) added a project to T79764: Rigid body primitive capsule is broken: Nodes & Physics.
Aug 14 2020, 3:41 AM · Nodes & Physics, BF Blender
Fernando Alcala (TriFractal) created T79764: Rigid body primitive capsule is broken.
Aug 14 2020, 3:41 AM · Nodes & Physics, BF Blender

Jul 8 2020

Fernando Alcala (TriFractal) added a comment to T76356: Very slow performance when copying rigid body physics.

2.83
I too have encountered this problem.
Some testing I did:
1 rigid to 50 objs = 0m:16s
1 rigid to 100 objs = 0m:33s
1 rigid to 150 objs = 0m:49s
1 rigid to 200 objs = 1m:07s
1 rigid to 250 objs = 1m:23s
1 rigid to 500 objs = 2m:58s
1 rigid to 1000 objs = 5m:52s
1 rigid to 2000 objs = 12m:02s
1 rigid to 5000 objs = 36m:52s

Jul 8 2020, 11:11 PM · Performance, Dependency Graph, Nodes & Physics, BF Blender