Convex and Prim physics

[Gearsawe Stonecutter]

Below is a quick explanation of the Convex and Prim type physics. And how SL may handle your model.

[TANAKAAKIO Inshan]

Thank you for your comprehensible figures.

 

[Gearsawe Stonecutter]

Actually for some complex phycis I handle buidl each hulls putting a small gap between each hull. In the case where I build them pre optimized I get better phycis cost. fewer hulls and veticies.

[Drongle McMahon]

Indeed. I find that the only way of getting the optimal set of hulls. Why the space is required, I have no idea.  A couple of other points...

First, I have found more and more cases, mostly bits of buildings, where the physcics cost of the undecomposed physics shape can be less than the decomposed shape. I think this is when all the triangles are big enough.

Second, you can make the physics shape for a corridor, room, tunnel etc. by flipping the normals so they all point to the inside, then using surface decomposition. If you leave the normals pointing outwards, the decomposition will fill in the space. See the translucent pipe bends in Runitai's MeshHQ region. The physics shapes are made of one-sided planes sides with inward pointing normals, not decomposed because decomposition fills in the inside of the large radius ouside the pipe. However, you can sometimes wriggle through the sides of the undecomposed shape, even though there are no gaps in the supplied mesh. I never wriggled through the decomposed shape.