private Model3DGroup Create3DScene(Point3D center, int xCount, int yCount, int zCount, float modelSize)
{
var semiTransparentBrush = new SolidColorBrush(Color.FromArgb(64, 200, 200, 200)); // alpha = 1/4
var diffuseMaterial = new DiffuseMaterial(semiTransparentBrush);
diffuseMaterial.Freeze(); // This will significantly speed up the creation of objects
var modelSizeWithMargin = modelSize * 1.2;
var size = new Size3D(xCount * modelSizeWithMargin, yCount * modelSizeWithMargin, zCount * modelSizeWithMargin);
var instancedData = InstancedMeshGeometry3DTest.CreateInstancesData(center, size, modelSize, xCount, yCount, zCount, false);
var model3DGroup = new Model3DGroup();
var boxMesh3D = new Ab3d.Meshes.BoxMesh3D(new Point3D(0, 0, 0), new Size3D(1, 1, 1), 1, 1, 1).Geometry;
for (int i = 0; i < instancedData.Length; i++)
{
var geometryModel3D = new GeometryModel3D(boxMesh3D, diffuseMaterial);
geometryModel3D.BackMaterial = diffuseMaterial;
geometryModel3D.Transform = new MatrixTransform3D(instancedData[i].World.ToWpfMatrix3D());
model3DGroup.Children.Add(geometryModel3D);
}
var modelVisual3D = new ModelVisual3D();
modelVisual3D.Content = model3DGroup;
MainViewport3D.Children.Add(modelVisual3D);
return(model3DGroup);
}
private void MainDXViewportViewOnDXSceneDeviceCreated(object sender, EventArgs e)
{
var instancedData = InstancedMeshGeometry3DTest.CreateInstancesData(center: new Point3D(0, 0, 0),
size: new Size3D(4 * XInstancesCount, 4 * YInstancesCount, 4 * ZInstancesCount),
modelScaleFactor: 1,
xCount: XInstancesCount, yCount: YInstancesCount, zCount: ZInstancesCount,
useTransparency: false);
// Update colors
int dataCount = instancedData.Length;
for (int i = 0; i < dataCount; i++)
{
float percentage = 1.0f - (float)i / (float)dataCount;
instancedData[i].DiffuseColor = new Color4(red: percentage, green: 1, blue: percentage, alpha: 1);
}
var boxMeshGeometry = new Ab3d.Meshes.BoxMesh3D(centerPosition: new Point3D(0, 0, 0), size: new Size3D(3, 3, 3), xSegments: 1, ySegments: 1, zSegments: 1).Geometry;
// The first InstancedMeshGeometry3DNode will get the instancedData and
// will also create the DirectX instance buffer.
_instancedMeshGeometry3DNode1 = new InstancedMeshGeometry3DNode(boxMeshGeometry);
_instancedMeshGeometry3DNode1.SetInstanceData(instancedData);
// Manually call InitializeResources.
// For this to work, the dxViewportView.DXScene must be set.
// This is the reason why this method is called inside a DXViewportView.DXSceneDeviceCreated event handler.
_instancedMeshGeometry3DNode1.InitializeResources(MainDXViewportView.DXScene);
_disposables.Add(_instancedMeshGeometry3DNode1);
var instanceBuffer = _instancedMeshGeometry3DNode1.GetInstanceBuffer();
if (instanceBuffer == null)
{
throw new Exception("GetInstanceBuffer returned null"); // Probably DXScene is not initialized
}
// Now create another 2 InstancedMeshGeometry3DNode objects
// and initialize it with already created instanceBuffer
// The next InstancedMeshGeometry3DNode will be also initialized so
// that all instances will be rendered with red color instead of the color defined in the instances data.
_instancedMeshGeometry3DNode2 = new InstancedMeshGeometry3DNode(boxMeshGeometry);
_instancedMeshGeometry3DNode2.SetInstanceBuffer(instanceBuffer, InstanceData.SizeInBytes, instancedData.Length, instancedData);
_instancedMeshGeometry3DNode2.UseSingleObjectColor(Colors.Red.ToColor4());
_disposables.Add(_instancedMeshGeometry3DNode2);
// The last InstancedMeshGeometry3DNode will render last part of the instances with the color defined in the instance data.
_instancedMeshGeometry3DNode3 = new InstancedMeshGeometry3DNode(boxMeshGeometry);
_instancedMeshGeometry3DNode3.SetInstanceBuffer(instanceBuffer, InstanceData.SizeInBytes, instancedData.Length, instancedData);
_disposables.Add(_instancedMeshGeometry3DNode3);
// Set StartInstanceIndex and InstancesCount
_startTime = DateTime.Now;
_lastStartRowIndex = int.MinValue;
UpdateHiddenInstancesPositions();
var rootSceneNode = new SceneNode();
rootSceneNode.AddChild(_instancedMeshGeometry3DNode1);
rootSceneNode.AddChild(_instancedMeshGeometry3DNode2);
rootSceneNode.AddChild(_instancedMeshGeometry3DNode3);
var sceneNodeVisual3D = new SceneNodeVisual3D(rootSceneNode);
MainViewport.Children.Add(sceneNodeVisual3D);
}
