OPC_Model.cpp

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/*
 *      OPCODE - Optimized Collision Detection
 *      Copyright (C) 2001 Pierre Terdiman
 *      Homepage: http://www.codercorner.com/Opcode.htm
 */





// Precompiled Header
#include "Stdafx.h"

using namespace Opcode;


Model::Model()
{
#ifdef __MESHMERIZER_H__        // Collision hulls only supported within ICE !
        mHull   = null;
#endif // __MESHMERIZER_H__
}


Model::~Model()
{
        Release();
}


void Model::Release()
{
        ReleaseBase();
#ifdef __MESHMERIZER_H__        // Collision hulls only supported within ICE !
        DELETESINGLE(mHull);
#endif // __MESHMERIZER_H__
}


bool Model::Build(const OPCODECREATE& create)
{
        // 1) Checkings
        if(!create.mIMesh || !create.mIMesh->IsValid()) return false;

        // For this model, we only support complete trees
        if(create.mSettings.mLimit!=1)  return SetIceError("OPCODE WARNING: supports complete trees only! Use mLimit = 1.\n", null);

        // Look for degenerate faces.
        udword NbDegenerate = create.mIMesh->CheckTopology();
        if(NbDegenerate)        Log("OPCODE WARNING: found %d degenerate faces in model! Collision might report wrong results!\n", NbDegenerate);
        // We continue nonetheless.... 

        Release();      // Make sure previous tree has been discarded [Opcode 1.3, thanks Adam]

        // 1-1) Setup mesh interface automatically [Opcode 1.3]
        SetMeshInterface(create.mIMesh);

        // Special case for 1-triangle meshes [Opcode 1.3]
        udword NbTris = create.mIMesh->GetNbTriangles();
    /*
        if(NbTris==1)
        {
                // We don't need to actually create a tree here, since we'll only have a single triangle to deal with anyway.
                // It's a waste to use a "model" for this but at least it will work.
                mModelCode |= OPC_SINGLE_NODE;
                return true;
        }
    */
        // 2) Build a generic AABB Tree.
        mSource = new AABBTree;
        CHECKALLOC(mSource);

        // 2-1) Setup a builder. Our primitives here are triangles from input mesh,
        // so we use an AABBTreeOfTrianglesBuilder.....
        {
                AABBTreeOfTrianglesBuilder TB;
                TB.mIMesh                       = create.mIMesh;
                TB.mSettings            = create.mSettings;
                TB.mNbPrimitives        = NbTris;
                if(!mSource->Build(&TB))        return false;
        }

        // 3) Create an optimized tree according to user-settings
        if(!CreateTree(create.mNoLeaf, create.mQuantized))      return false;

        // 3-2) Create optimized tree
        if(!mTree->Build(mSource))      return false;

        // 3-3) Delete generic tree if needed
        if(!create.mKeepOriginal)       DELETESINGLE(mSource);

#ifdef __MESHMERIZER_H__
        // 4) Convex hull
        if(create.mCollisionHull)
        {
                // Create hull
                mHull = new CollisionHull;
                CHECKALLOC(mHull);

                CONVEXHULLCREATE CHC;
                // ### doesn't work with strides
                CHC.NbVerts                     = create.mIMesh->GetNbVertices();
                CHC.Vertices            = create.mIMesh->GetVerts();
                CHC.UnifyNormals        = true;
                CHC.ReduceVertices      = true;
                CHC.WordFaces           = false;
                mHull->Compute(CHC);
        }
#endif // __MESHMERIZER_H__

        return true;
}


udword Model::GetUsedBytes() const
{
        if(!mTree)      return 0;
        return mTree->GetUsedBytes();
}