Yet another physics shape bug?

[ChinRey]

• Rez cylinder
• Size: 33-62-4
• Rotation: 0-270-179
• Pathcut: 0.85-0.95
• Hollow: 95.0
• Physics Shape Type: Prim
• Show Physics Shape: It shows up as a prim
• Walk across it: it's a convex hull

Anybody seen something similar before?

[Drongle McMahon]

Interesting. I suspect this is a deliberately introduced effect, like the switch to covex hull for walls at 0.5m thick. Similarly, that one only shows up in navmesh test view, not in the physics shape display, because the server doesn't tell the viewer it's changed. It is sensitive to the pathcut length. Here are two thin cylinders (0.6m high) with x=y=62 and 95% pathcut at the top 0.84-1.00, bottom 0.85-1.00. Doesn't seem to depend on hollow%.



[ChinRey]

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Drongle McMahon wrote:

Interesting. I suspect this is a deliberately introduced effect, like the switch to covex hull for walls at 0.5m thick.

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Yes probably, but it's hard to see why. This isn't a shape that shuld cause HAVOK any problems. I made an exact mesh replica of the shape I started with and it had a physics weight of just 1.2.

 

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Drongle McMahon wrote:

Doesn't seem to depend on hollow%.

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No, it seems to be all about the total amount of pathcut. Mikka Luik did some tests that confirm your result, the threshold is 0.85 total pathcut.

[Drongle McMahon]

"Yes probably, but it's hard to see why."

:matte-motes-shocked: You are expecting a rational explanation? How long have you been here? :matte-motes-smile:

[ChinRey]

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Drongle McMahon wrote:

:matte-motes-shocked: You are expecting a rational explanation? How long have you been here? :matte-motes-smile:

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 I stand corrected.