ofxAssimpModelLoader getmesh doesn't seem work properly

beginners
#1

Hello! I read that import collada could be “tricky”, the CustomShapesExample works amazing well, but i’m having trouble to import my own model (made in Blender, triangulating faces) . the object looks fine with drawFaces(), but when i use drawDebug() I can see that the mesh doesn’t have the right form. I need this to manage the collisions in ofxBullet, I’m right?

The thing is that with the OF logo model (by Lauren Licherdell) the mesh draws perfectly, the trouble must be in my model. just don’t know what is missing :S

I hope you can help me

#2

Well, i see.
Here more details.
This is my model

And this is what im getting

Note that the lines is for world.drawDebug(). When I use the astrowalk model instead, the faces draw pretty well, but the mesh, seeing with drawdebug, are in different position than the model.

I 've been trying with 3ds extension, but some bug don’t let me import because “the chunk is too large” says :confused:

#3

After a while i’m getting with this. For the record, I made an update to ofxBulletv2.0 and put some code from https://github.com/trotil/ofxBullet wich made objects collide correctly with the terrain imported with ofxAssimpModelLoader.
http://imgur.com/SHLcKhu

I had to add some code because it was showing some wrong. Here an example
http://imgur.com/gFjC52B

And this is how look my add Mesh method now.

  
  
bool ofxBulletCustomShape::addMesh( ofMesh a_mesh, ofVec3f a_localScaling, bool a_bUseConvexHull ) {  
	if(a_mesh.getMode() != OF_PRIMITIVE_TRIANGLES) {  
		ofLog( OF_LOG_ERROR, "ofxBulletCustomShape :: addMesh : mesh must be set to OF_PRIMITIVE_TRIANGLES!! aborting");  
		return false;  
	}  
	if(_bAdded == true) {  
		ofLog( OF_LOG_ERROR, "ofxBulletCustomShape :: addMesh : can not call after calling add()" );  
		return false;  
	}  
  
	btVector3 localScaling( a_localScaling.x, a_localScaling.y, a_localScaling.z );  
	vector <ofIndexType>	indicies = a_mesh.getIndices();  
	vector <ofVec3f>		verticies = a_mesh.getVertices();  
  
	btVector3 centroid = btVector3(0, 0, 0);  
  
	if(!a_bUseConvexHull) {  
		for(int i = 0; i < verticies.size(); i++) {  
			btVector3 tempVec = btVector3(verticies[i].x, verticies[i].y, verticies[i].z);  
			tempVec *= localScaling;  
			centroid += tempVec;  
		}  
		centroid /= (float)verticies.size();  
  
//		vector<btVector3> newVerts;  
//		for ( int i = 0; i < indicies.size(); i++) {  
//			btVector3 vertex( verticies[indicies[i]].x, verticies[indicies[i]].y, verticies[indicies[i]].z);  
//			vertex *= localScaling;  
//			vertex -= centroid;  
//			newVerts.push_back(vertex);  
     btTriangleMesh* trimesh = new btTriangleMesh();  
  
    for ( int i = 0; i < indicies.size()/3; i++) {  
        int index0 = indicies[i*3];  
        int index1 = indicies[i*3+1];  
        int index2 = indicies[i*3+2];  
  
        btVector3 vertex0( verticies[index0].x, verticies[index0].y, verticies[index0].z );  
        btVector3 vertex1( verticies[index1].x, verticies[index1].y, verticies[index1].z );  
        btVector3 vertex2( verticies[index2].x, verticies[index2].y, verticies[index2].z );  
  
        vertex0 *= localScaling;  
        vertex1 *= localScaling;  
        vertex2 *= localScaling;  
   
// this code corrects the position of the mesh  
        vertex0 -= centroid;  
        vertex1 -= centroid;  
        vertex2 -= centroid;  
  
        trimesh->addTriangle(vertex0, vertex1, vertex2);  
  
    }  
  
//		btConvexHullShape* convexShape = new btConvexHullShape(&(newVerts[0].getX()), newVerts.size());  
//		convexShape->setMargin( 0.01f );  
//		shapes.push_back( convexShape );  
  
		btBvhTriangleMeshShape *shapetr = new btBvhTriangleMeshShape(trimesh, false);  
        shapes.push_back( shapetr );  
  
		centroids.push_back( ofVec3f(centroid.getX(), centroid.getY(), centroid.getZ()) );  
	} else {  
		// HULL Building code from example ConvexDecompositionDemo.cpp //  
		btTriangleMesh* trimesh = new btTriangleMesh();  
  
		for ( int i = 0; i < indicies.size()/3; i++) {  
			int index0 = indicies[i*3];  
			int index1 = indicies[i*3+1];  
			int index2 = indicies[i*3+2];  
  
			btVector3 vertex0( verticies[index0].x, verticies[index0].y, verticies[index0].z );  
			btVector3 vertex1( verticies[index1].x, verticies[index1].y, verticies[index1].z );  
			btVector3 vertex2( verticies[index2].x, verticies[index2].y, verticies[index2].z );  
  
			vertex0 *= localScaling;  
			vertex1 *= localScaling;  
			vertex2 *= localScaling;  
  
			trimesh->addTriangle(vertex0, vertex1, vertex2);  
		}  
  
		//cout << "ofxBulletCustomShape :: addMesh : input triangles = " << trimesh->getNumTriangles() << endl;  
		//cout << "ofxBulletCustomShape :: addMesh : input indicies = " << indicies.size() << endl;  
		//cout << "ofxBulletCustomShape :: addMesh : input verticies = " << verticies.size() << endl;  
  
		btConvexShape* tmpConvexShape = new btConvexTriangleMeshShape(trimesh);  
  
		//create a hull approximation  
		btShapeHull* hull = new btShapeHull(tmpConvexShape);  
		btScalar margin = tmpConvexShape->getMargin();  
		hull->buildHull(margin);  
		tmpConvexShape->setUserPointer(hull);  
  
		centroid = btVector3(0., 0., 0.);  
		for (int i = 0; i < hull->numVertices(); i++) {  
			centroid += hull->getVertexPointer()[i];  
		}  
		centroid /= (float)hull->numVertices();  
  
		//printf("ofxBulletCustomShape :: addMesh : new hull numTriangles = %d\n", hull->numTriangles());  
		//printf("ofxBulletCustomShape :: addMesh : new hull numIndices = %d\n", hull->numIndices());  
		//printf("ofxBulletCustomShape :: addMesh : new hull numVertices = %d\n", hull->numVertices());  
  
		btConvexHullShape* convexShape = new btConvexHullShape();  
		for (int i=0;i<hull->numVertices();i++) {  
			convexShape->addPoint(hull->getVertexPointer()[i] - centroid);  
		}  
  
		delete tmpConvexShape;  
		delete hull;  
  
		shapes.push_back( convexShape );  
		centroids.push_back( ofVec3f(centroid.getX(), centroid.getY(), centroid.getZ()) );  
	}  
	return true;  
}