koobas.hobune.stream
Is it possible to make a Mesh Collider thicker?
I'm having problem of moving rigidbody objects going through mesh terrain, even with '`Continous Collision Detection`' is enabled. A good solution proposed here is to make the ground collider thicker.
Now, since I am using a mesh collider for the ground, is there a way to make the mesh collider thicker?
One way is to make a new mesh using the old mesh. Here's an example that uses the normal for each vertex, although it's far from perfect - mostly because the higher the perturbation, the smoother the mesh will get, and it doesn't handle seams to smoothing groups well. But, it's not a bad starting point.
using UnityEngine;
using System.Collections;
public class Test : MonoBehaviour {
void Awake()
{
MeshCollider mc = GetComponent<MeshCollider>();
mc.sharedMesh = ThickerMeshUsingNormals( mc.sharedMesh, 1.0f );
}
// Function only cares about verts, tris and normals...
// Which should be fine because we're only messing with
// this stuff for collision
Mesh ThickerMeshUsingNormals( Mesh m, float fPerturb )
{
// USE THE NORMALS TO INFLATE THE MESH
// We're going to store the new results as a new
// verts list.
Vector3 [] rv3OrigVerts = m.vertices;
Vector3 [] rv3Norms = m.normals;
int nVertCt = rv3OrigVerts.Length;
Vector3 [] rv3NewVerts = new Vector3[ nVertCt ];
for( int i = 0; i < nVertCt; ++i )
rv3NewVerts[i] = rv3OrigVerts[i] + rv3Norms[i] * fPerturb;
// CREATE AND RETURN THE MESH
Mesh mRet = new Mesh();
mRet.vertices = rv3NewVerts;
mRet.triangles = m.triangles;
// A cheap thing to do would be to just transfer the
// old normals, although that wouldn't be right (both
// in spirit, and mathematically).
//
// mRet.normals = rv3Norms;
mRet.RecalculateNormals();
return mRet;
}
}
$$anonymous$$aking a mesh collider by using vertex's normal? That is smart. But I got your point. The higher the perturbation, the smoother it gets. I suppose it is like inflating a balloon.
Accepted your answer, since you provided an approach on how to make mesh collider thicker (Inflating). A good starting point.
how fast is the object moving to the ground ? and have u changed or altered game time in anyway ? is it anywhere on the ground or some areas where there is deformation ? also have u tried DontGoThroughThings
@markedagain How fast the objects move? Free fall by the gravity. Have I changed the game time? Nope. $$anonymous$$y terrain has a lot of deformation, and occasionally falls through it.
I tried that script at skin 1.0 and objects still penetrates, however, at lesser frequency than before.
if the issue happens in certain areas can u not simply put some small box colliers near ground level to fortify that gap ? not really a solution , and i dont have much more since i work very little with mesh colliders
