cocos3d create mesh programmatically - mesh

Question

I am struggling with creating mesh objects programmatically.
This is perfectly working:
CC3MeshNode *pMeshBox = [[CC3MeshNode alloc] init];
[pMeshBox populateAsCenteredRectangleWithSize:CGSizeMake(3, 3) andTessellation:ccg(5, 0)]; // AsSphereWithRadius:1 andTessellation:ccg(5, 0)]; // edges, rounded-corners
[self addChild:pMeshBox];
[pMeshBox release];
But this does not show anything (I expect a flat square of height 0 which and spawns in x/z direction).
float fPolygonVertices[] = {
-3, 0, 3,
3, 0, 3,
3, 0, -3,
-3, 0, -3
};
CC3VertexLocations* pvlPolygon = [CC3VertexLocations vertexArrayWithName: #"PolygonVL"];
pvlPolygon.vertexCount = 4;
pvlPolygon.vertices = fPolygonVertices;
CC3VertexArrayMesh* pvamPolygon = [CC3VertexArrayMesh meshWithName:#"PolygonM"];
pvamPolygon.vertexLocations = pvlPolygon;
CC3MeshNode *pMeshNode = [[CC3MeshNode alloc] init];
pMeshNode.mesh = pvamPolygon;
ccColor3B color = { 50, 0, 200 };
pMeshNode.color = color;
[self addChild:pMeshNode];
[pMeshNode release];
I assume camera setting and everything else is correct as the scene shows the populateAsCenteredRectangleWithSize created object...
I tried various color and material settings but without luck.

Answer 1

Try this:
GLuint totalVertexCount = 4;
GLuint triangleCount = 2;
CC3MeshNode *pMeshNode = [[CC3MeshNode alloc] init];
//[pMeshNode setPureColor:color];
//[pMeshNode setIsTouchEnabled:YES];
CC3VertexArrayMesh* theArrayMesh = [pMeshNode prepareParametricMesh];
// Prepare the vertex content and allocate space for vertices and indices.
[theArrayMesh ensureVertexContent];
theArrayMesh.allocatedVertexCapacity = totalVertexCount;
theArrayMesh.allocatedVertexIndexCapacity = (triangleCount * 3);
GLushort* indices = theArrayMesh.vertexIndices.vertices;
/*
* 1-------0
* | /| -z
* | / | ⥣
* | / | =>+x
* | / |
* | / |
* | / |
* |/ |
* 2-------3
*/
{
[theArrayMesh setVertexLocation: cc3v(3, 0, -3) at: 0];
[theArrayMesh setVertexLocation: cc3v(-3, 0, -3) at: 1];
[theArrayMesh setVertexLocation: cc3v(-3, 0, 3) at: 2];
[theArrayMesh setVertexLocation: cc3v(3, 0, 3) at: 3];
}
GLubyte indxIndx = 0;
GLubyte vtxIndx = 0;
for (int side = 0; side < 1; side++) {
// First trangle of side - CCW from bottom left
indices[indxIndx++] = vtxIndx++; // vertex 0
indices[indxIndx++] = vtxIndx++; // vertex 1
indices[indxIndx++] = vtxIndx; // vertex 2
// Second triangle of side - CCW from bottom left
indices[indxIndx++] = vtxIndx++; // vertex 2
indices[indxIndx++] = vtxIndx++; // vertex 3
indices[indxIndx++] = (vtxIndx - 4); // vertex 0
}
[self addChild:pMeshNode];