protected void updateHardwareBuffers()
{
if (mChainElementList.Count < 2)
{
return;
}
// Here. we need to compute the position of the camera in the coordinate system of the billboard chain.
Vector3 eyePos = this.ParentNode._getDerivedOrientation().Inverse() *
(mCamera.GetDerivedPosition() - this.ParentNode._getDerivedPosition());
IntPtr ptrBuff;
uint buffIdx = 0;
int chainSize = mChainElementList.Count;
mVD.vertexCount = (uint)chainSize * 2;
// Setup the vertex coordinates
HardwareVertexBufferSharedPtr pPosBuffer = mVD.vertexBufferBinding.getBuffer(POSITION_BINDING);
ptrBuff = pPosBuffer.Get().Lock(HardwareBuffer.LockOptions.HBL_DISCARD);
// Compute the position of the vertices in the chain
for (int i = 0; i < chainSize; i++)
{
myBillBoardChainElement bbe = (myBillBoardChainElement)mChainElementList[i];
Vector3 chainTangent;
if (i == 0)
{
chainTangent = bbe.position - ((myBillBoardChainElement)mChainElementList[0]).position;
}
else if (i == chainSize - 1)
{
chainTangent = ((myBillBoardChainElement)mChainElementList[chainSize - 1]).position -
((myBillBoardChainElement)mChainElementList[chainSize - 2]).position;
}
else
{
chainTangent = ((myBillBoardChainElement)mChainElementList[i + 1]).position -
((myBillBoardChainElement)mChainElementList[i - 1]).position;
}
Vector3 p1 = bbe.position;
Vector3 vP1ToEye = eyePos - p1;
Vector3 vPerpendicular = chainTangent.Cross(vP1ToEye);
vPerpendicular.Normalize();
vPerpendicular *= bbe.width;
Vector3 pos0 = p1 - vPerpendicular;
Vector3 pos1 = p1 + vPerpendicular;
// Update the buffer with the 2 vertex positions
MeshBuilderHelper.SetVertexFloat(ptrBuff, mVBVertexSize, buffIdx++, mVBPostOff,
pos0.x, pos0.y, pos0.z);
MeshBuilderHelper.SetVertexFloat(ptrBuff, mVBVertexSize, buffIdx++, mVBPostOff,
pos1.x, pos1.y, pos1.z);
}
pPosBuffer.Get().Unlock();
// Setup the diffuse color of the vertex
HardwareVertexBufferSharedPtr pVertexColorBuffer = mVD.vertexBufferBinding.getBuffer(DIFFUSE_COLOR_BINDING);
ptrBuff = pVertexColorBuffer.Get().Lock(HardwareBuffer.LockOptions.HBL_DISCARD);
buffIdx = 0;
for (int i = 0; i < chainSize; i++)
{
Color col = ((myBillBoardChainElement)mChainElementList[i]).colour;
MeshBuilderHelper.SetVertexFloat(ptrBuff, mVCBVertexSize, buffIdx++, mVCBrgbaOff,
((float)col.R / 255.0f), ((float)col.G / 255.0f), ((float)col.B / 255.0f), ((float)col.A / 255.0f));
MeshBuilderHelper.SetVertexFloat(ptrBuff, mVCBVertexSize, buffIdx++, mVCBrgbaOff,
((float)col.R / 255.0f), ((float)col.G / 255.0f), ((float)col.B / 255.0f), ((float)col.A / 255.0f));
}
pVertexColorBuffer.Get().Unlock();
// Setup the texture coordinates
HardwareVertexBufferSharedPtr pTexCoordBuffer = mVD.vertexBufferBinding.getBuffer(TEXCOORD_BINDING);
ptrBuff = pTexCoordBuffer.Get().Lock(HardwareBuffer.LockOptions.HBL_DISCARD);
buffIdx = 0;
for (int i = 0; i < chainSize; i++)
{
myBillBoardChainElement bbe = (myBillBoardChainElement)mChainElementList[i];
MeshBuilderHelper.SetVertexFloat(ptrBuff, mTCVertexSize, buffIdx++, mTCBuvOff,
bbe.uTexCoord, 0.0f);
MeshBuilderHelper.SetVertexFloat(ptrBuff, mTCVertexSize, buffIdx++, mTCBuvOff,
bbe.uTexCoord, 1.0f);
}
pTexCoordBuffer.Get().Unlock();
}
public void insertChainElement(int index, myBillBoardChainElement e)
{
mChainElementList.Insert(index, e);
}
public void addChainElement(myBillBoardChainElement e)
{
mChainElementList.Add(e);
}
public void updateChainElement(int index, myBillBoardChainElement e)
{
mChainElementList[index] = e;
}
protected override void CreateScene()
{
mSceneManager.SetSkyBox(true, "Examples/CloudyNoonSkyBox");
mLog = LogManager.Singleton.createLog("DemoCustomObjects.log", false, true);
mLog.LogMessage(string.Format("DemoCustomObjects log {0}", System.DateTime.Now));
create4LineDebugOverLay();
Show4LineDebugOverLay();
Entity e;
SceneNode n;
Plane plane = new Plane();
plane.Normal.x = 0;
plane.Normal.y = 1;
plane.Normal.z = 0;
plane.D = 0;
MeshManager.GetSingleton().CreatePlane("Myplane", "General", plane,
14500, 14500, 10, 10, true, 1, 50, 50, Vector3.UnitZ);
e = mSceneManager.CreateEntity("plane", "Myplane");
e.SetMaterialName("Examples/GrassFloor");
e.SetCastShadows(false);
n = mSceneManager.GetRootSceneNode().CreateChildSceneNode("Myplane");
n.AttachObject(e);
//##MyLine3D test
mLog.LogMessage("test line 0");
myLine = new myLine3D();
mLog.LogMessage("test line 1");
myLine.addPoint(new Vector3(0.0f, 9.6f, 0.0f));
myLine.addPoint(new Vector3(160.0f, 9.6f, 0.0f));
myLine.addPoint(new Vector3(160.0f, 9.6f, 160.0f));
myLine.addPoint(new Vector3(0.0f, 9.6f, 160.0f));
myLine.addPoint(new Vector3(0.0f, 9.6f, 0.0f));
mLog.LogMessage("test line 2");
myLine.drawLines();
mLog.LogMessage("test line 3");
n = mSceneManager.GetRootSceneNode().CreateChildSceneNode("Line1");
mLog.LogMessage("test line 4");
n.AttachObject(myLine);
mLog.LogMessage("test line 5");
n.SetPosition(0.0f, 200.0f, 0.0f);
//##
/***/
//## bill board chain
mLog.LogMessage("test BBC 1");
mBBC = new DemoCustomObjects.myBillBoardChain(mCamera, 1000);
mBBC.setMaterial("DemoCustomObjects/smoketrail");
for (int i = 0; i < 500; i++)
{
myBillBoardChainElement ce = new myBillBoardChainElement(
new Vector3((float)Math.Sin((double)i / 100.0 * 2.0 * Math.PI),
(float)Math.Cos((double)i / 100.0 * 2.0 * Math.PI),
(float)i / 100.0f),
0.1f,
(float)i / 10.0f,
Converter.GetColor(1.0f, 1.0f, 1.0f));
mBBC.addChainElement(ce);
}
mBBC.updateBoundingBox();
// Add it to the scene
n = mSceneManager.GetRootSceneNode().CreateChildSceneNode("BBC");
n.AttachObject(mBBC);
n.SetPosition(0.0f, 100.0f, 0.0f);
n.SetScale(50.0f, 50.0f, 50.0f);
mLog.LogMessage("test BBC 2");
//##
/***/
mCamera.Move(new Vector3(0, 300, 600));
mCamera.LookAt = new Vector3(0, 0, -600);
SetDebugCaption(2, "keys: Y updates and adds a new point");
SetDebugCaption(3, " U updates and deletes the new point");
}
