CONCAVE CONVEX Questions
Okay, I have been looking up convex and concave at.
http://www.rustycode.com/tutorials/convex.htmlCool explanation and help.
Right I need to build the phys mesh out of convex meshes in the tutorial above it gets a bit confusing.
At this point a lot of artists get the bright idea of just cloning the original mesh and using that as the collision mesh. This seems like a good idea except that then your collision mesh isn't convex!
This is a very common first time mistake among Torque artists. It is even further complicated by the fact that the Player can even walk on this collision mesh without too much difficultly. But if you were to shoot a Projectile at this mesh it would go right through!
So how do we create a collision mesh that matches up to our visible mesh and is convex? The secret is to use multiple collision meshes!
multiple collision meshes is the key word.
In my image below is this correct? I am adding an extra collision mesh so there is 2 collision meshes. Should I join these two meshes to form one phys mesh? For this handle I'm going to keep it simple like below.

Can I clarify let me know if this statement is correct.
When one extrudes it leaves an object hollow....this is not what is wanted. What is wanted is each object to be enclosed.
The below picture is not correct as these extensions were extruded and not closed

This should be correct each mesh is its own closed shape(I hid the sides so one can see the inside)

This has to be correct I am effectively creating half an arch out of convex meshes like the example.
An arch is a very concave shape and would be impossible to accurately approximate with a single convex collision mesh. Instead we can use several convex collision meshes and get a much closer approximation of the shape of the arch:
If this is not correct please show me how to do this correctly.
I can't seem to grasp concave and convex meshes