Search found 141 matches

by RBD
Mon Jul 13, 2015 12:26 pm
Forum: Applications, Games, Demos or Movies using Bullet
Topic: Hydraulic Cylinders, Excavator Arms, Hexapod Simulation
Replies: 4
Views: 9497

Re: Hydraulic Cylinders, Excavator Arms, Hexapod Simulation

While there is some variability in load pressure, there is always high pressure in hydraulic hoses, it's not like there is a lot of pressure when a piston moves and no pressure when there is no movement. Having said that, to answer your question: Each hydraulic hose does have its own stiffness param...
by RBD
Sun Jul 12, 2015 1:25 pm
Forum: Applications, Games, Demos or Movies using Bullet
Topic: Hydraulic Cylinders, Excavator Arms, Hexapod Simulation
Replies: 4
Views: 9497

Re: Hydraulic Cylinders, Excavator Arms, Hexapod Simulation

Very simplified, no fluid dynamics, just a linear constraint motor (push / pull) connecting rod to cylinder, limited by a max force (≈ max hydraulic pushing/pulling force).
by RBD
Thu Jul 09, 2015 5:23 pm
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: Simple and Efficient Approximate Convex Decomposition
Replies: 41
Views: 52061

Re: Simple and Efficient Approximate Convex Decomposition

khaled, showing off use of V-HACD in an animation: YouTube video: Homemade Hydraulic Cylinders, Excavator Arms, Hexapod - Bullet Blender I ran V-HACD on Blender extruded curve objects (before bevelling) with a collision margin set to the bevel depth, then bevelled the curve objects after, so collisi...
by RBD
Thu Jul 09, 2015 5:16 pm
Forum: Applications, Games, Demos or Movies using Bullet
Topic: Hydraulic Cylinders, Excavator Arms, Hexapod Simulation
Replies: 4
Views: 9497

Hydraulic Cylinders, Excavator Arms, Hexapod Simulation

Tried some Bullet rigid body dynamic simulations entirely and exclusively driven by hydraulic cylinders.
See video description on YouTube for more details...
YouTube video: Homemade Hydraulic Cylinders, Excavator Arms, Hexapod - Bullet Blender
Image
by RBD
Thu May 28, 2015 7:37 pm
Forum: Applications, Games, Demos or Movies using Bullet
Topic: Bullet Physics Collision Margins and Shapes
Replies: 8
Views: 29902

Re: Bullet Physics Collision Margins and Shapes

Convex Hull Margin Blender add-on updated for the latest Blender version (2.74) and attached here (for now). This Blender add-on allows users to create an approximate convex hull mesh from any Blender object with an optional margin value used to shrink or expand the convex hull. - Use a margin of 0...
by RBD
Tue May 05, 2015 1:30 pm
Forum: Links, Papers, Libraries, Demos, Movies, Comparisons
Topic: Interaction with Geometry video now public on GDC Vault
Replies: 3
Views: 7717

Re: Interaction with Geometry video now public on GDC Vault

Good talk, thank you very much.

For those of us presented with a black box containing "Get Flash" and no video...
Here are MP4 video links of Mr. Melax's talk: small, medium, large, HD
by RBD
Tue Mar 10, 2015 6:39 pm
Forum: Links, Papers, Libraries, Demos, Movies, Comparisons
Topic: Rubikon : Valve's physics engine for Source 2
Replies: 8
Views: 21240

Re: Rubikon : Valve's physics engine for Source 2

Excellent, thank you for the link to the GDC talk PDFs, that's perfect.

Yes, I mistakenly made assumptions from all of those "PhysX" names, thanks for clarifying.
by RBD
Tue Mar 10, 2015 1:40 pm
Forum: Links, Papers, Libraries, Demos, Movies, Comparisons
Topic: Rubikon : Valve's physics engine for Source 2
Replies: 8
Views: 21240

Re: Rubikon : Valve's physics engine for Source 2

The engine has been referred to for a while, but I haven't yet come across much information, and since Source 2 is now official, I was thinking maybe there would be some doc on Rubikon somewhere. I thought I'm not looking in the right places or perhaps just need to be more patient. Sorry to bother, ...
by RBD
Mon Mar 09, 2015 9:29 pm
Forum: Links, Papers, Libraries, Demos, Movies, Comparisons
Topic: Rubikon : Valve's physics engine for Source 2
Replies: 8
Views: 21240

Rubikon : Valve's physics engine for Source 2

Could someone (Dirk? :wink:) please point us to more detailed information about Rubikon, Valve's physics engine for Source 2?
Thanks.
by RBD
Fri Dec 19, 2014 3:10 pm
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: Simple and Efficient Approximate Convex Decomposition
Replies: 41
Views: 52061

Re: Simple and Efficient Approximate Convex Decomposition

That's excellent, I like it a lot. And, great, simply decreasing the maximum allowed concavity fixed the above example issue. edit : Yeah... as you get used to the params, the way it works, and a little patience, it's very good stuff. 8) Lots of fun to be had... http://i.imgur.com/9lxvUbQ.jpg Thanks...
by RBD
Thu Dec 18, 2014 2:11 pm
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: Simple and Efficient Approximate Convex Decomposition
Replies: 41
Views: 52061

Re: Simple and Efficient Approximate Convex Decomposition

From playing with V-HACD, I have to say that overall it's been working very well. For some objects with diagonal parts it appears to perform better when they are rotated... so I've added a pre-processing option to the plug-in to apply transformations to the generated / exported mesh. (hopefully last...
by RBD
Tue Dec 16, 2014 5:55 pm
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: Simple and Efficient Approximate Convex Decomposition
Replies: 41
Views: 52061

Re: Simple and Efficient Approximate Convex Decomposition

is it possible to release the script under a more permissive license (e.g., BSD license)? Done. On Linux 64bit and Blender 2.72b (and maybe on other POSIX systems), I had to change[...] Thanks for testing and reporting! I've applied the change, thank you. I've updated the add-on (attached) Changes ...
by RBD
Sun Dec 14, 2014 11:15 pm
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: Simple and Efficient Approximate Convex Decomposition
Replies: 41
Views: 52061

Re: Simple and Efficient Approximate Convex Decomposition

it would be great if someone creates some plugins for V-HACD for easy integration with popular editors (i.e., Max, Maya...) Adding V-HACD to Blender would require a well thought out code patch, at this time core team has a lot on their plate, not to mention unified physics, which, with compound sup...
by RBD
Thu Dec 11, 2014 1:56 pm
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: Simple and Efficient Approximate Convex Decomposition
Replies: 41
Views: 52061

Re: Simple and Efficient Approximate Convex Decomposition

Good points and analysis, thanks Khaled. Yes indeed, proper testing would be needed to determine the actual impact on physics simulation performance; my instincts may be that the physics engine generally works better with rounder rather than long(er) thin(er) convex hulls, but I can't be sure of thi...
by RBD
Mon Dec 08, 2014 3:54 pm
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: Simple and Efficient Approximate Convex Decomposition
Replies: 41
Views: 52061

Re: Simple and Efficient Approximate Convex Decomposition

Thanks for the nice visual results. There are some meshes where HACD just doesn't work well and V-HACD can obviously handle quite well. So, with some meshes, V-HACD works where HACD doesn't, great work with that. But for others... Correct me I'm wrong, but I get the feeling that V-HACD is very well ...