public void QueryForRenderChunks(ref RenderPassDesc desc)
{
boundingBoxDrawnThisFrame = true;
if (!desc.RenderCamera.ViewFrustum.Intersects(boundingBox))
{
return;
}
// Draw bounding boxes
GeometryChunk boxChunk = this.parent.Game.Graphics.AllocateGeometryChunk();
boxChunk.Indices = boundingBoxIndexBuffer;
boxChunk.VertexStreams.Add(this.boundingBoxVertBuffer);
boxChunk.WorldTransform = Matrix.Identity;
boxChunk.VertexCount = this.boundingBoxMesh.Length;
boxChunk.StartIndex = 0;
boxChunk.VertexStreamOffset = 0;
boxChunk.PrimitiveCount = 12; // Number of trianges that are required to render a cube.
boxChunk.Material = boundingBoxMaterial;
boxChunk.RenderTechniqueName = boundingBoxMaterial.CurrentTechnique;
boxChunk.Type = PrimitiveType.TriangleList;
}
public void QueryForRenderChunks(BoundingFrustum bFrustum, ref Plane clippingPlane, LOD DetailLevel, ref RenderPassDesc desc)
{
// If a clipping plane exists, check which side the box is on
if (null != clippingPlane)
{
PlaneIntersectionType intersection = clippingPlane.Intersects(this.boundingBox);
// If all geometry is on the back side of the plane, then no need to render it
if (intersection == PlaneIntersectionType.Back)
{
return;
}
}
// Check if QuadTree bounding box intersection the current view frustum
if (!bFrustum.Intersects(this.boundingBox))
{
return;
}
// Only draw leaves on the tree, never the main tree branches themselves.
if (isLeaf)
{
GeometryChunk chunk = this.Game.Graphics.AllocateGeometryChunk();
chunk.Indices = this.leafPatch.indexBuffers[(int)DetailLevel];
chunk.VertexStreams.Add(terrain.VertexBuffer);
chunk.WorldTransform = Matrix.Identity;
chunk.VertexCount = this.width * this.width;
chunk.StartIndex = 0;
chunk.VertexStreamOffset = this.vertexBufferOffset;
chunk.PrimitiveCount = this.leafPatch.numTris[(int)DetailLevel];
chunk.Material = this.terrain.Material;
if (this.Game.Settings.GraphicsLevel > GraphicsLevel.Low && DetailLevel == LOD.High)
{
float distanceToBoundingBox = GetDistanceBetweenCameraNearPlaneAndBoundingBox(bFrustum, this.boundingBox);
// If the entire terrain patch is far enough from the camera then we lower the shader quality.
if (distanceToBoundingBox < QSConstants.MinQuadTreeCubeCenterDistance / 2)
{
chunk.RenderTechniqueName = "MultiTexturedNormaled";
}
else
{
chunk.RenderTechniqueName = "MultiTextured";
}
}
else
{
chunk.RenderTechniqueName = "MultiTextured";
}
chunk.CanCreateShadows = false; // Terrain does not cast shadows, it would be very expensive
chunk.CanReceiveShadows = true;
chunk.Type = PrimitiveType.TriangleList;
if (this.terrain.DisplayBoundingBoxes)
{
// Draw bounding boxes
GeometryChunk boxChunk = this.Game.Graphics.AllocateGeometryChunk();
boxChunk.Indices = boundingBoxIndexBuffer;
boxChunk.VertexStreams.Add(this.boundingBoxVertBuffer);
boxChunk.WorldTransform = Matrix.Identity;
boxChunk.VertexCount = this.BoundingBoxMesh.Length;
boxChunk.StartIndex = 0;
boxChunk.VertexStreamOffset = 0;
boxChunk.PrimitiveCount = 12; // Number of trianges that are required to render a cube.
boxChunk.Material = boundingBoxMaterial;
boxChunk.RenderTechniqueName = boundingBoxMaterial.CurrentTechnique;
boxChunk.CanCreateShadows = false;
boxChunk.CanReceiveShadows = true;
boxChunk.Type = PrimitiveType.TriangleList;
}
}
// If there are branches on this node, move down through them recursively
else if (childQuadTrees.Length > 0)
{
for (int i = 0; i < childQuadTrees.Length; ++i)
{
childQuadTrees[i].QueryForRenderChunks(bFrustum, ref clippingPlane, DetailLevel, ref desc);
}
}
}
