Null – 12D Wiki

Null Triangles by Angle/Length (Seed)

This option is used to Null (remove) Triangles by Angle and Length with a Seed Point. The seed point is the starting point for the nulling by angle and length, which is particularly useful for nulling internal areas of a tin. Continue down the page to see the Null Triangles by Angle and Length (Seed) [...]

Null Triangles by Angle/Length

This option is used to Null (remove) Triangles by Angle and Length. Continue down the page to see the Null Triangles by Angle and Length option. To Null Triangles by Angle and Length, Use: Tins => Null => by Angle/Length Firstly select the Tin to null the triangles from the drop down list, in this [...]

Null Triangles by Length

This option is used to Null (remove) Triangles by length. Continue down the page to see the Null Triangles by Length option. To Null Triangles by Length, Use: Tins => Null => by Length Firstly select the Tin to null the triangles from the drop down list, in this example we have selected ‘survey’. Type [...]

Null Triangles – Outside of a Polygon

This option is used to Null (remove) any Triangle whose centroid is outside a selected polygon. Continue down the page to see the Null Triangles Outside Polygon options. To Null Triangles Outside Polygon, Use: Tins => Null => Null After a TIN has been created, it can be edited at any time and one of [...]

Null Triangles by Centroids

This option is used to Null (remove) Triangles from a TIN by selecting a model of strings and using their centroid. Continue down the page to see the Null Triangles by Centroids option. To Null Triangles by Centroids, Use: Tins => Null => by Centroids Pick the ‘survey tin’ from the drop down menu. Select [...]

Tin Include/Exclude

This TIN Include/Exclude option is used to Null (remove) or Reset (turn on) the Triangles inside a single polygon. The video below will show how to use the TIN Include/Exclude option. Or continue down the page to see the TIN Include/Exclude options. https://www.youtube.com/watch?v=E1BY8a52KZM To Include/Exclude triangles within a polygon, Use: Tins => Null => Include/Exclude [...]

Null by Strings

This TIN Null by Strings option is used to Null (remove) Triangles in a triangulation. The video below will show how to use the TIN Null by Strings option. Or continue down the page to see the TIN Null by Strings options. https://www.youtube.com/watch?v=0j7b-vCJI4Y To Null Triangles by Strings, Use: Tins => Null => by Strings [...]

Resetting all Nulled Triangles

This option is used to Reset (reinstate) all Triangles which have been nulled. Continue down the page to see the Resetting all Nulled Triangles options. To Reset All Nulled Triangles, Use: Tins => Null => Reset Firstly select the Tin to reset the triangles from the drop down list, in this example we have selected [...]

Null by Point

This TIN Null by Point option is used to Null (remove) or Reset (turn on) the Triangles in a triangulation. The video below will show how to use the TIN Null by Point option. Or continue down the page to see the TIN Null by Point options. https://www.youtube.com/watch?v=zF7J5WSBr74 To Null Triangles by Points, Use: Tins [...]

Null by Polygons

If you are used to nulling triangles by drafting a freehand rectangle on the screen, then you might be stumped by the new ‘Null Triangles by Polygon’ panel. The default pick method is the pink arrow, which will let you choose an existing polygon. But it’s a hassle to draft the rectangle first, then to [...]