private ScreenSpaceLineNode CreateLinesWithLineMesh(Vector3[] linePositions, bool isLineStrip, bool isLineClosed, Color lineColor, float xOffset, out ScreenSpaceLineMesh screenSpaceLineMesh)
{
if (linePositions == null || linePositions.Length < 2)
{
screenSpaceLineMesh = null;
return(null);
}
// If line is closed but the first position is not the same as the last position, then add the first position as the last one
if (isLineClosed && linePositions[0] != linePositions[linePositions.Length - 1])
{
Array.Resize(ref linePositions, linePositions.Length + 1);
linePositions[linePositions.Length - 1] = linePositions[0];
}
// If we can easily calculate the bounding box from line positions
// it is recommended to specify it in the ScreenSpaceLineMesh constructor.
// If boundingBox is not specified, it will be calculated in the ScreenSpaceLineMesh constructor with checking all the positions.
//
// NOTE: If bounding box is not correct then camera's near and far planes can be invalid and this can cut some 3D objects at near or far plane (when DXScene.OptimizeNearAndFarCameraPlanes is true - by default)
//var boundingBox = new BoundingBox(new Vector3(startX, 0, startZ), new Vector3(startX + linesCount * margin, 0, endZ));
// Create ScreenSpaceLineMesh - it is used to create DirectX vertex buffer from positions
screenSpaceLineMesh = new ScreenSpaceLineMesh(linePositions, isLineStrip);
// When the line positions are changed many times, it is recommended to set CreateDynamicVertexBuffer to true.
screenSpaceLineMesh.CreateDynamicVertexBuffer = true;
var lineMaterial = new LineMaterial()
{
LineColor = lineColor.ToColor4(),
LineThickness = 2
};
var screenSpaceLineNode = new ScreenSpaceLineNode(screenSpaceLineMesh, lineMaterial);
screenSpaceLineNode.Transform = new Transformation(SharpDX.Matrix.Translation(xOffset, 0, 0));
// To show ScreenSpaceLineNode in DXViewportView we need to put it inside a SceneNodeVisual3D
var sceneNodeVisual3D = new SceneNodeVisual3D(screenSpaceLineNode);
MainViewport.Children.Add(sceneNodeVisual3D);
_disposables.Add(screenSpaceLineMesh);
_disposables.Add(screenSpaceLineNode);
_disposables.Add(lineMaterial);
return(screenSpaceLineNode);
}
private void ChangePositions(ScreenSpaceLineNode screenSpaceLineNode, ScreenSpaceLineMesh screenSpaceLineMesh)
{
ChangePositions(screenSpaceLineMesh.Positions);
// Recreate vertex buffer that is defined with ScreenSpaceLineMesh
screenSpaceLineMesh.RecreateMesh();
// Update bounds of the mesh and SceneNode.
BoundingBox boundingBox;
BoundingBox.FromPoints(screenSpaceLineMesh.Positions, out boundingBox); // We could set boundingBox manually, but for demonstration purpose we calculate it from the positions
screenSpaceLineMesh.Bounds.SetBoundingBox(ref boundingBox);
screenSpaceLineNode.UpdatePositions();
screenSpaceLineNode.UpdateBounds();
}
