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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.0 (2010/01/01)
#include "ClipMesh.h"
#include "PartitionMesh.h"
WM5_WINDOW_APPLICATION(ClipMesh);
//----------------------------------------------------------------------------
ClipMesh::ClipMesh ()
:
WindowApplication3("SampleMathematics/ClipMesh", 0, 0, 640, 480,
Float4(0.75f, 0.75f, 0.75f, 1.0f)),
mTextColor(1.0f, 1.0f, 1.0f, 1.0f)
{
}
//----------------------------------------------------------------------------
bool ClipMesh::OnInitialize ()
{
if (!WindowApplication3::OnInitialize())
{
return false;
}
// Set up the camera.
mCamera->SetFrustum(60.0f, GetAspectRatio(), 0.1f, 1000.0f);
APoint camPosition(16.0f, 0.0f, 4.0f);
AVector camDVector(-1.0f, 0.0f, 0.0f);
AVector camUVector(0.0f, 0.0f, 1.0f);
AVector camRVector = camDVector.Cross(camUVector);
mCamera->SetFrame(camPosition, camDVector, camUVector, camRVector);
CreateScene();
// Initial update of objects.
mScene->Update();
// Initial culling of scene.
mCuller.SetCamera(mCamera);
mCuller.ComputeVisibleSet(mScene);
InitializeCameraMotion(0.01f, 0.001f);
InitializeObjectMotion(mTorus);
return true;
}
//----------------------------------------------------------------------------
void ClipMesh::OnTerminate ()
{
mScene = 0;
mTorus = 0;
mMeshPlane = 0;
mTorusWireState = 0;
WindowApplication3::OnTerminate();
}
//----------------------------------------------------------------------------
void ClipMesh::OnIdle ()
{
MeasureTime();
if (MoveCamera())
{
mCuller.ComputeVisibleSet(mScene);
}
if (MoveObject())
{
Update();
mScene->Update();
mCuller.ComputeVisibleSet(mScene);
}
if (mRenderer->PreDraw())
{
mRenderer->ClearBuffers();
mRenderer->Draw(mCuller.GetVisibleSet());
DrawFrameRate(8, GetHeight()-8, mTextColor);
mRenderer->PostDraw();
mRenderer->DisplayColorBuffer();
}
UpdateFrameCount();
}
//----------------------------------------------------------------------------
bool ClipMesh::OnKeyDown (unsigned char key, int x, int y)
{
if (WindowApplication3::OnKeyDown(key, x, y))
{
return true;
}
switch (key)
{
case 'w':
case 'W':
mTorusWireState->Enabled = !mTorusWireState->Enabled;
return true;
}
return false;
}
//----------------------------------------------------------------------------
void ClipMesh::CreateScene ()
{
mScene = new0 Node();
VertexFormat* vformat = VertexFormat::Create(2,
VertexFormat::AU_POSITION, VertexFormat::AT_FLOAT3, 0,
VertexFormat::AU_COLOR, VertexFormat::AT_FLOAT3, 0);
// The plane is fixed at z = 0.
mPlane.SetNormal(AVector::UNIT_Z);
mPlane.SetConstant(0.0f);
mMeshPlane = StandardMesh(vformat).Rectangle(32, 32, 16.0f, 16.0f);
VisualEffectInstance* instance =
VertexColor3Effect::CreateUniqueInstance();
instance->GetEffect()->GetWireState(0,0)->Enabled = true;
mMeshPlane->SetEffectInstance(instance);
mScene->AttachChild(mMeshPlane);
VertexBufferAccessor vba(mMeshPlane);
Float3 green(0.0f, 1.0f, 0.0f);
int i;
for (i = 0; i < vba.GetNumVertices(); ++i)
{
vba.Color<Float3>(0, i) = green;
}
// Get the positions and indices for a torus.
mTorus = StandardMesh(vformat).Torus(64, 64, 4.0f, 1.0f);
instance = VertexColor3Effect::CreateUniqueInstance();
mTorusWireState = instance->GetEffect()->GetWireState(0, 0);
mTorus->SetEffectInstance(instance);
mScene->AttachChild(mTorus);
vba.ApplyTo(mTorus);
mTorusVerticesMS.resize(vba.GetNumVertices());
mTorusVerticesWS.resize(vba.GetNumVertices());
Float3 black(0.0f, 0.0f, 0.0f);
for (i = 0; i < vba.GetNumVertices(); ++i)
{
mTorusVerticesMS[i] = vba.Position<Float3>(i);
mTorusVerticesWS[i] = mTorusVerticesMS[i];
vba.Color<Float3>(0, i) = black;
}
IndexBuffer* ibuffer = mTorus->GetIndexBuffer();
int numIndices = ibuffer->GetNumElements();
int* indices = (int*)ibuffer->GetData();
mTorusIndices.resize(numIndices);
memcpy(&mTorusIndices[0], indices, numIndices*sizeof(int));
Update();
}
//----------------------------------------------------------------------------
void ClipMesh::Update ()
{
// Transform the model-space vertices to world space.
int numVertices = (int)mTorusVerticesMS.size();
int i;
for (i = 0; i < numVertices; ++i)
{
mTorusVerticesWS[i] = mTorus->LocalTransform*mTorusVerticesMS[i];
}
// Partition the torus mesh.
std::vector<APoint> clipVertices;
std::vector<int> negIndices, posIndices;
PartitionMesh(mTorusVerticesWS, mTorusIndices, mPlane, clipVertices,
negIndices, posIndices);
// Replace the torus vertex buffer.
numVertices = (int)clipVertices.size();
int stride = mTorus->GetVertexFormat()->GetStride();
VertexBuffer* vbuffer = new0 VertexBuffer(numVertices, stride,
Buffer::BU_STATIC);
mTorus->SetVertexBuffer(vbuffer);
VertexBufferAccessor vba(mTorus);
Float3 black(0.0f, 0.0f, 0.0f);
for (i = 0; i < numVertices; ++i)
{
// Transform the world-space vertex to model space.
vba.Position<Float3>(i) =
mTorus->LocalTransform.Inverse()*clipVertices[i];
vba.Color<Float3>(0, i) = black;
}
// Modify the vertex color based on which mesh the vertices lie.
int negQuantity = (int)negIndices.size();
for (i = 0; i < negQuantity; ++i)
{
vba.Color<Float3>(0, negIndices[i])[2] = 1.0f;
}
int posQuantity = (int)posIndices.size();
for (i = 0; i < posQuantity; ++i)
{
vba.Color<Float3>(0, posIndices[i])[0] = 1.0f;
}
// To display the triangles generated by the split.
int numIndices = negQuantity + posQuantity;
IndexBuffer* ibuffer = new0 IndexBuffer(numIndices, sizeof(int));
mTorus->SetIndexBuffer(ibuffer);
int* indices = (int*)ibuffer->GetData();
memcpy(indices, &negIndices[0], negQuantity*sizeof(int));
memcpy(indices + negQuantity, &posIndices[0], posQuantity*sizeof(int));
}
//----------------------------------------------------------------------------
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