Topography by points creates a wrong boundary

1

Hello guys,

when I create a topo surface in Dynamo via Topography by Points, it creates a different boundary. I searched a bit about that topic and I found it that it is possible in Revit 2020 to create via Polymesh facets and points.
My question: How can I get those vertices of polymesh?

I try to get points from a floor and create topography.

Thanks a lot!

grafik
grafik584Ă—753 3.79 KB

Topo_von_Geschossdecke.dyn (38.1 KB)

2

I can create a sub region but it does not help me… I have to trim everything by hand after creating topo. It takes too much time :S

3

Hi @Deniz_Maral !
Do you reallly need a topogrphy ? If not you can get back the shape in Revit with a DirectShape or .sat file.

4

Unfortunately I need it as topography. In Site model elements are as slab shapes and it is very difficult to edit them. For example I need to demolish part of slab and for that I have to copy it > edit boundary > edit points and for second part same thing.

I can’t use “Parts” because it show its inneredges in plans and it seems very complicated for infrastructure.

5

Here is an example:

grafik
grafik995Ă—725 9.96 KB

The yellow stands for demolished. So I have use topo to edit surface via “split surface” and demolish it.
Here I had to edit boundary per hand and deleted incorrect parts.

6

@Alban_de_Chasteigner has a node, that takes points and facets to create a topography but I can’t feed it with indices.
grafik

7

I would use dynamo to split the floor in two parts and phase them, and you will keep them i the right category.
And i think we can not control the way points are triangulated in Revit.
edit : i will try this node !

8

I have done it but it creates ugly lines:

grafik
grafik1499Ă—397 164 KB

9

you can hide it in Visibility/overides graphic

10

Nope, for parts you can’t hide them.

11

Hi Deniz,

Here is an example to use this custom node:
I used a dwg to get the points and indices.

Create Toposurface
Create Toposurface2652Ă—852 216 KB

Create Toposurface2
Create Toposurface21795Ă—1141 244 KB

Create Toposurface.dyn (15.6 KB)

12

@Deniz_Maral
Did you try :
1.edit boundary of the floor
2.copy the boundary
3.split topo
4.paste copied boundary

13

If you can Copy and Paste the boundary of floor, it Sounds to be a nice idea. I will let you know tomorrow about it.

14

Hello Alban,

Thank you very much for your efforts. My problem is to get that mesh geometry from floor. I got face vertex points but not indices.

15

Hello Alban,
I tried your node and your suggestion but I can’t create topo from triangulations and points. However I can create a mesh… Why is it like that?

grafik
grafik1093Ă—817 182 KB

16

Hi Deniz,

A PolymeshFacet represents a triangular piece. Each facet is defined by indices of three vertices of the polymesh.
I don’t think your list of PolymeshFacets is correct.

PolymeshFacet
PolymeshFacet1093Ă—817 183 KB

17

Hello Alban,

thank you for your reply.

Their source is the same… Can be an iteration problem?

grafik
grafik1423Ă—751 205 KB

18

You’re right.

Are there any points with the same x and y ?
Can you copy the python node of the custom node and read the error message ?

19 
Warnung:IronPythonEvaluator.EvaluateIronPythonScript fehlgeschlagen.
Traceback (most recent call last):
  File "<string>", line 33, in <module>
Exception: There are invalid facets. Facets with more than two points with same x, y are not allowed.
Parameter name: facets

You are right. There are some points which have same X and Y. Should I prune duplicates?

20

Yes, it should work.
You will lose the points which are vertical to each other but the creation of topography is thus limited. (and less efficient than creating a mesh)