/// <summary>
/// Add tolerance around the ViewportBounds if the ClipToBounds property is set.
/// </summary>
private void AddClippingTolerance()
{
if (bounds.ClipToViewport && RenderTolerance.ViewportClippingTolerance > 0)
{
SilhouetteEdgeTriangle[] edgeTriangles = new SilhouetteEdgeTriangle[8];
double tolerance = RenderTolerance.ViewportClippingTolerance;
double left = bounds.ViewportBounds.Left;
double right = bounds.ViewportBounds.Right;
double top = bounds.ViewportBounds.Top;
double bottom = bounds.ViewportBounds.Bottom;
Point3D topLeft = new Point3D(left, top, 0);
Point3D topRight = new Point3D(right, top, 0);
Point3D bottomLeft = new Point3D(left, bottom, 0);
Point3D bottomRight = new Point3D(right, bottom, 0);
edgeTriangles[0] = new SilhouetteEdgeTriangle(topLeft, topRight, tolerance);
edgeTriangles[1] = new SilhouetteEdgeTriangle(topRight, topLeft, tolerance);
edgeTriangles[2] = new SilhouetteEdgeTriangle(topRight, bottomRight, tolerance);
edgeTriangles[3] = new SilhouetteEdgeTriangle(bottomRight, topRight, tolerance);
edgeTriangles[4] = new SilhouetteEdgeTriangle(bottomRight, bottomLeft, tolerance);
edgeTriangles[5] = new SilhouetteEdgeTriangle(bottomLeft, bottomRight, tolerance);
edgeTriangles[6] = new SilhouetteEdgeTriangle(bottomLeft, topLeft, tolerance);
edgeTriangles[7] = new SilhouetteEdgeTriangle(topLeft, bottomLeft, tolerance);
RenderToToleranceShader ignoreClipBounds = new RenderToToleranceShader(edgeTriangles, buffer);
// Rasterize to WindowBounds because RenderBounds (==ViewportBounds in this case)
// will clip the outside of the silhouette edge triangles.
ignoreClipBounds.Rasterize(new Rect(bounds.WindowSize));
}
}
private void RenderSilhouetteTolerance(ProjectedGeometry geometry, RenderBuffer rasterization, VisibleFaces faces)
{
List <Edge> silhouetteEdges = null;
// Choose list based on triangle winding/facing
switch (faces)
{
case VisibleFaces.Front:
silhouetteEdges = geometry.FrontFaceSilhouetteEdges;
break;
case VisibleFaces.Back:
silhouetteEdges = geometry.BackFaceSilhouetteEdges;
break;
default:
throw new NotSupportedException("Cannot render these type of faces: " + faces);
}
// Outline edge detection
if (RenderTolerance.SilhouetteEdgeTolerance > 0)
{
// Create a set of triangles that will draw lines on the tolerance buffer
SilhouetteEdgeTriangle[] edgeTriangles = new SilhouetteEdgeTriangle[2 * silhouetteEdges.Count];
int count = 0;
//double the silhouette pixel tolerance in nonstandard DPI scenario.
//This compensates for differences in anti-aliasing sampling patterns in high and low DPI
double tolerance = RenderTolerance.SilhouetteEdgeTolerance;
if (!RenderTolerance.IsSquare96Dpi)
{
tolerance *= 4;
}
foreach (Edge edge in silhouetteEdges)
{
// FWD triangle
edgeTriangles[count++] = new SilhouetteEdgeTriangle(edge.Start, edge.End, tolerance);
// BWD triangle
edgeTriangles[count++] = new SilhouetteEdgeTriangle(edge.End, edge.Start, tolerance);
}
// Render our ignore geometry onto the tolerance buffer.
RenderToToleranceShader edgeIgnore = new RenderToToleranceShader(edgeTriangles, rasterization);
edgeIgnore.Rasterize(bounds.RenderBounds);
}
}
