Dear friends :face_with_peeking_eye:, I have a question about synchronizing the scaling of PhysicsShapes with a Mesh in the Havok physics engine. I’m animating the growth of a mesh, but while the mesh scales up, its physical shape remains unchanged. How can I synchronize the scaling of the physical …

See the last section “if you scale the mesh” [image] Using density and an Overview of physics properties If you scale the mesh, you’ll have to generate a new shape (and dispose the old one). Just generate the new shape and assign it to your existing body: mesh.physicsBody.shape = newShape

Thank you, HiGreg. That sounds like a reasonable suggestion. I’ll try updating it not on every frame of the render loop, but at some interval, and I’ll let you know how much it impacts performance. I’ll try using a multiplier and update the shape from the start to the end of the animation every 60th…

Actually, it works quite well. Here’s an example with the apple mesh, where I get and replace the shape every second. The apples grow properly. I simply call the function with the mesh as an argument and recreate the shape based on the mesh’s scaling. Of course, in the future, I’d like to have the a…

There is a potential performance optimization if scaling a complicated or hard-to-regenerate shape. I note that “addChild()” on a SHAPE_CONTAINER includes a scaling vector. With this in mind, adding an existing shape to a container shape and using the scale parameter might perform better than regene…

As a framework user, it would be convenient for me if there were a parameter like mesh.physicsBody.syncShapeWithMesh = true for physicsBody (or something like that). However, if I need to update the shape programmatically, it would probably be enough to have the ability to change the parameters of t…

Synchronizing the scaling of PhysicsShapes with a Mesh

Questions

HiGreg September 18, 2024, 3:18am 2

See the last section “if you scale the mesh”

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Synchronizing the scaling of PhysicsShapes with a Mesh

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