source: trunk/VUT/GtpVisibilityPreprocessor/src/ViewCell.cpp @ 262

#include "ViewCell.h"
#include "Mesh.h"
#include "MeshKdTree.h"
#include "Triangle3.h"


ViewCell::ViewCell(Mesh *mesh): mMesh(mesh), mPvs(NULL) 
{
}

ViewCell::~ViewCell()
{
        // NOTE: should I really do this here? (I know that there is only one mesh per view cell)
        DEL_PTR(mMesh);
}

Mesh *ViewCell::GetMesh() 
{
        return mMesh;
}

BspPvs *ViewCell::GetPVS() 
{
        return mPvs;
}

AxisAlignedBox3 ViewCell::GetBox()
{
        return mMesh->mBox;
}
  
int ViewCell::CastRay(Ray &ray) 
{
        return 0;
}
  
bool ViewCell::IsConvex() 
{
        return mMesh->mIsConvex;
}

bool ViewCell::IsWatertight() 
{
        return mMesh->mIsWatertight;
}

float ViewCell::IntersectionComplexity() 
{
        return (float)mMesh->mFaces.size();
}

int ViewCell::Type() const 
{ 
        return VIEWCELL; 
}

void  ViewCell::GetRandomSurfacePoint(Vector3 &point, Vector3 &normal) 
{
        point = Vector3(0,0,0);
}

void ViewCell::DeriveViewCells(const ObjectContainer &objects, 
                                                           ViewCellContainer &viewCells, 
                                                           const int maxViewCells)
{
        // maximal max viewcells
        int limit = maxViewCells > 0 ? Min((int)objects.size(), maxViewCells) : (int)objects.size();

        for (int i = 0; i < limit; ++i)
        {
                Intersectable *object = objects[i];
                
                // extract the mesh instances
                if (object->Type() == Intersectable::MESH_INSTANCE)
                {
                        MeshInstance *inst = dynamic_cast<MeshInstance *>(object);

                        ViewCell *viewCell = new ViewCell(inst->GetMesh());
                        viewCells.push_back(viewCell);
                }
                //TODO: transformed meshes
        }
}

ViewCell *ViewCell::ExtrudeViewCell(const Triangle3 &baseTri, const float height)
{
        // one mesh per view cell
        Mesh *mesh = new Mesh();
        
        //-- construct prism

        // bottom 
        mesh->mFaces.push_back(new Face(0,1,2));
        // top
    mesh->mFaces.push_back(new Face(5,4,3));
        // sides
        mesh->mFaces.push_back(new Face(0, 3, 4, 1));
        mesh->mFaces.push_back(new Face(1, 4, 5, 2));
        mesh->mFaces.push_back(new Face(0, 2, 5, 3));


        //--- extrude new vertices for top of prism
        Vector3 triNorm = baseTri.GetNormal();

        Triangle3 topTri;       

        // add base vertices and calculate top vertices
        for (int i = 0; i < 3; ++i)
        {
                 mesh->mVertices.push_back(baseTri.mVertices[i]);
                 topTri.mVertices[i] = baseTri.mVertices[i] + height * triNorm;
        }

        // add top vertices     
        for (int i = 0; i < 3; ++i)
                mesh->mVertices.push_back(topTri.mVertices[i]);
        
        return new ViewCell(mesh);
}