Hight Order Primitive

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RobyDx

Regular
Joined
Feb 16, 2004
Messages
55
I have 2 problems:
1)I want to draw cubic bezier rectangular patch. When I draw 1 path I put vertex from left to right and up to down to create a 4 x 4 group (an array of 16 vertex). How I must order then if for example I want to create a plane of 4 x 4 patch?
2)How work patch mesh? I create one, I use tessellate applied to the normal mesh and in present it give me an error if I draw the mesh that I tessellate.

patchMesh.Tessellate(4, normalMesh)
normalMesh.DrawSubset(i)


Initialitation code is this

Dim paInfo As New PatchInformation
paInfo.BasisType = BasisType.BSpline
paInfo.PatchType = PatchType.Rectangle
paInfo.Degree = DegreeType.Cubic
paInfo.TessellateLevel = New Single() {3, 3, 3, 3}
Dim elementi() As VertexElement = {New VertexElement(0, 0, DeclarationType.Float3, DeclarationMethod.Default, DeclarationUsage.Position, 0), New VertexElement(0, 12, DeclarationType.Float3, DeclarationMethod.Default, DeclarationUsage.Normal, 0), New VertexElement(0, 24, DeclarationType.Float2, DeclarationMethod.Default, DeclarationUsage.TextureCoordinate, 0), VertexElement.VertexDeclarationEnd}

PatchMesh = New PatchMesh(device, paInfo, 4, normalMesh.NumberVertices, elementi)

How it works patchMesh? Anyone can help me or give me a website that cover also in C++ this topic?
 
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