I got this surface on the left made by choosing a contour, the same as a polyline.
I would like to see the triangles to cover the contour the same way as the hatch in the object on the right.
No triangle should be build I the corner marked with A! That region is outside the contour/polyline.
What should I do?
I know I could pick the contour as a bounders after making the surface in order to achieve this.
But why does Autocad triangulate outside the polyline at the first place?
Solved! Go to Solution.
Solved by neilyj666. Go to Solution.
Without a boundary definition the algorithm seeks the nearst node and draws a triangle.
....only when you tell Civil 3D that it is.....
neilyj (No connection with Autodesk other than using the products in the real world)
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If you use a contour as a contour it's just a contour. If you use it as a breakline (often work better) it's then a breakline. It's never a boundary unless you define it as one. Define it as an Outer boundary and check NonDestructive Breaklines. That should give you what you want.
Allen Jessup
Engineering Specialist / CAD Manager
Thanks everybody!
That is what I normally do: use the contour to make a surface then chose the same contour again as an outer boundary!
But this is an extra step to trim off triangles outside the contour!
If one moves along the contour line all triangles should be on the same side, but this is not the case!
But it works fine with hatch command!
The hatch command looks for a closed boundary made up of one or more line, arcs or polylines. When creating a surface from a contour Civil 3D does not look at the polyline. It takes the X,Y,Z of each vertex and uses them as a point file to create the surface. You've got 2 very dissimilar commands.
You can also create a surface from a thousand contours. If you have 82 closed contours in the surface. What should the program do with them? Not use them as boundaries! This is one of the cases where Autodesk would respond that the program "Works as expected". For once I'd agree with them.
Allen Jessup
Engineering Specialist / CAD Manager
@Anonymous wrote:Thanks everybody!
That is what I normally do: use the contour to make a surface then chose the same contour again as an outer boundary!
But this is an extra step to trim off triangles outside the contour!
If one moves along the contour line all triangles should be on the same side, but this is not the case!
But it works fine with hatch command!
I agree that is a pain to have to add the same data twice but it's unavoidable.
I presume you mean that the hatch command can find a boundary easily (as can BPOLY and LINEWORKSHRINKWRAP) but these work with different objects for a different purpose
neilyj (No connection with Autodesk other than using the products in the real world)
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