Search found 121 matches

by zhy149
01 Jul 2023, 23:15
Forum: General questions
Topic: Tune object's property to grasp stably
Replies: 4
Views: 930

Re: Tune object's property to grasp stably

https://drive.google.com/file/d/17Zz3VQL7VDT5-9mhzljUAyFi5oC3o4UX/view?usp=share_link Hello, there can be many sources for the shaking. So it is important to first understand why it is shaking. Can you share a simplified, self-containing scene that illustrates the shaking? In general, try to use pr...
by zhy149
01 Jul 2023, 17:00
Forum: General questions
Topic: Transform STL import to pure or convex shape
Replies: 3
Views: 1273

Re: Transform STL import to pure or convex shape

https://drive.google.com/file/d/19OEC2mvDiWqUl0VfhlRpxFg6t68OfD2f/view?usp=share_link Hello, it is very difficult to make that procedure automatic. For complex meshes, your best option that you already mentioned is the convex decomposition method. Sometimes you need to first decimate a shape, befor...
by zhy149
29 Jun 2023, 14:47
Forum: General questions
Topic: Tune object's property to grasp stably
Replies: 4
Views: 930

Re: Tune object's property to grasp stably

Hello, I tried to import objects from YCB datasets (without texture.stl). But after they are converted into convex shapes in CoppeliaSim, they don't seem to be stable. I'd like to ask if there is a tutorial instructs how to tune object's property, and how each change affects the object's dynamics. ...
by zhy149
28 Jun 2023, 21:55
Forum: General questions
Topic: Tune object's property to grasp stably
Replies: 4
Views: 930

Tune object's property to grasp stably

Hello, I tried to import objects from YCB datasets (without texture.stl). But after they are converted into convex shapes in CoppeliaSim, they don't seem to be stable. I'd like to ask if there is a tutorial instructs how to tune object's property, and how each change affects the object's dynamics. T...
by zhy149
14 Apr 2023, 14:24
Forum: General questions
Topic: How to make ellipsoid cylinder in the simulator?
Replies: 1
Views: 467

How to make ellipsoid cylinder in the simulator?

Hello,

I want to make some ellipsoid cylinders in the simulator where everything is the same as cylinder except that x and y of the bottom surface can be different.
Can anyone give me some hints on this?

Thanks in advance!
by zhy149
09 Sep 2022, 14:52
Forum: General questions
Topic: Complex polygon shape design or import
Replies: 6
Views: 1463

Re: Complex polygon shape design or import

What Coppelia meant is to copy/paste cuboids so that their convex hull is exactly the shape you need. Here I used one cuboid, and an additional dummy (parent) to use as rotation center, copy/paste, rotate i th dummy by 2\pi\frac{i}{n} , group, and use the function "Morph selection into convex ...
by zhy149
07 Sep 2022, 15:35
Forum: General questions
Topic: Complex polygon shape design or import
Replies: 6
Views: 1463

Re: Complex polygon shape design or import

Hello, in general, primitive shapes and/or convex shapes perform best. So if you import a shape, its icon in the scene hierarchy tells you whether it is convex or not. If it is not convex, then you can generate a convex shape from it with [Menu bar --> Edit --> Morph selection into convex shapes]. ...
by zhy149
07 Sep 2022, 13:29
Forum: General questions
Topic: Complex polygon shape design or import
Replies: 6
Views: 1463

Re: Complex polygon shape design or import

Hello, in general, primitive shapes and/or convex shapes perform best. So if you import a shape, its icon in the scene hierarchy tells you whether it is convex or not. If it is not convex, then you can generate a convex shape from it with [Menu bar --> Edit --> Morph selection into convex shapes]. ...
by zhy149
07 Sep 2022, 03:06
Forum: General questions
Topic: Complex polygon shape design or import
Replies: 6
Views: 1463

Complex polygon shape design or import

Hello, I want to do some grasping on some shapes like pentagons, hexagons, etc which don't belong to primitive shapes. Is making these shapes from external resources and importing mesh the only way or I can make these shapes inside the cop-Elia simulator? I imported some shapes from outside but thei...
by zhy149
25 Jun 2022, 01:51
Forum: General questions
Topic: Grasping Force and Friction Adjustment
Replies: 1
Views: 677

Grasping Force and Friction Adjustment

Hello, when I'm grasping some objects such as cylinder with a parallel jaw gripper but the grasping doesn't seem very stable, how should I deal with changing the grasping force threshold and friction stuff if you could provide me some hints and examples? Thank you!