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package require vtk
package require vtkinteraction
#
# create a triangular texture
#
# Create the RenderWindow, Renderer and both Actors
#
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
vtkTriangularTexture aTriangularTexture
aTriangularTexture SetTexturePattern 1
aTriangularTexture SetXSize 32
aTriangularTexture SetYSize 32
vtkPoints points
points InsertPoint 0 0.0 0.0 0.0
points InsertPoint 1 1.0 0.0 0.0
points InsertPoint 2 .5 1.0 0.0
points InsertPoint 3 1.0 0.0 0.0
points InsertPoint 4 0.0 0.0 0.0
points InsertPoint 5 .5 -1.0 .5
vtkFloatArray tCoords
tCoords SetNumberOfComponents 2
tCoords InsertTuple2 0 0.0 0.0
tCoords InsertTuple2 1 1.0 0.0
tCoords InsertTuple2 2 .5 .86602540378443864676
tCoords InsertTuple2 3 0.0 0.0
tCoords InsertTuple2 4 1.0 0.0
tCoords InsertTuple2 5 .5 .86602540378443864676
vtkPointData pointData
pointData SetTCoords tCoords
vtkCellArray triangles
triangles InsertNextCell 3
triangles InsertCellPoint 0
triangles InsertCellPoint 1
triangles InsertCellPoint 2
triangles InsertNextCell 3
triangles InsertCellPoint 3
triangles InsertCellPoint 4
triangles InsertCellPoint 5
vtkPolyData triangle
triangle SetPolys triangles
triangle SetPoints points
[triangle GetPointData] SetTCoords tCoords
vtkPolyDataMapper triangleMapper
triangleMapper SetInput triangle
vtkTexture aTexture
aTexture SetInputConnection [aTriangularTexture GetOutputPort]
vtkActor triangleActor
triangleActor SetMapper triangleMapper
triangleActor SetTexture aTexture
ren1 SetBackground .3 .7 .2
ren1 AddActor triangleActor
ren1 ResetCamera
[ren1 GetActiveCamera] Zoom 1.5
# render the image
#
iren AddObserver UserEvent {wm deiconify .vtkInteract}
iren Initialize
# prevent the tk window from showing up then start the event loop
wm withdraw .
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