concave_mesh_shape.md

ConcaveMeshShape

ConcaveMeshShape extends ConcaveShape

This class represents a static concave mesh shape.

Note that collision detection with a concave mesh shape can be very expensive. You should only use this shape for a static mesh.

Create

You need TriangleMesh to create ConvexMeshShape

1. Create triangle mesh

local mesh = rp3d.createTriangleMesh()

2. Create triangle array to add in mesh

   2.1 Create from lua table.(normals can be nil)

   local vertices = {}
   vertices[0] = -3;
   vertices[1] = -3;
   vertices[2] = 3;
   vertices[3] = 3;
   vertices[4] = -3;
   vertices[5] = 3;
   vertices[6] = 3;
   vertices[7] = -3;
   vertices[8] = -3;
   
   local indices = {}
   indices[0] = 0;
   indices[1] = 1;
   indices[2] = 2;
   
   local normals = {}
   normals[0] = 1;
   normals[1] = 0;
   normals[2] = 0;
   normals[3] = 1;
   normals[4] = 0;
   normals[5] = 0;
   normals[6] = 1
   normals[7] = 0;
   normals[8] = 0;
   
   local array = rp3d.createTriangleVertexArray(vertices, indices, normals)

   2.2 Create from mesh vertices

   local res = go.get("/meshes#concave", "vertices")
   local buf = resource.get_buffer(res)
   local array = rp3d.createTriangleVertexArrayFromMeshVerticesCopy(buf)

3. Add array in triangle mesh

mesh:addSubpart(array)

4. Create shape

local shape = rp3d.createConcaveMeshShape(mesh) 

Methods

• ConcaveMeshShape:getNbSubparts() number
• ConcaveMeshShape:getNbTriangles(subPart) number
• ConcaveMeshShape:getTriangleVerticesIndices(subPart,triangleIndex) number[3]

---

ConcaveMeshShape:getNbSubparts()

Return the number of sub parts contained in this mesh.

RETURN

• (number)

---

ConcaveMeshShape:getNbTriangles(subPart)

Return the number of triangles in a sub part of the mesh.

PARAMETERS

• subPart (number)

---

ConcaveMeshShape:getTriangleVerticesIndices(subPart,triangleIndex)

Return the indices of the three vertices of a given triangle in the array.

PARAMETERS

• subPart (number)
• triangleIndex (number)

RETURN

• (vector3[])