Python

Polygons and triangles correspondence after triangulating a mesh in Blender

Nikita

One of the methods for mesh analytics is exploring its triangulated geometry. For example, such exploration is used when searching for polygons that overlaps in the mesh itself or in its UV. In order to return the result obtained after analyzing the triangulated mesh back to the original mesh, we need to know the exact correspondence between the original polygon and the triangles created from it.

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Working with inputs and outputs for the Capture Attribute Node in Blender Geometry Nodes

Nikita

Starting with Blender 4.2, the Capture Attribute node has changed in functionality. If earlier this node always had only one “Value” input and only one “Attribute” output, intended for recording attributes, in addition to the standard geometry socket, then starting with version 4.2, the number of inputs/outputs for recording attributes has been made dynamic.

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Selecting edges on the boundaries of a mesh in Blender

Nikita
2 Comments / Blender 3D / /

It is often necessary to select all the boundary edges of a mesh – edges that are on the outer perimeter of the mesh, or located around areas of the mesh that are not filled by polygons. This operation can be performed by the user from the 3D Viewport menu: Select – Select Loops – Select Boundary Loop.

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Creating a custom UI window in Blender using PySide

Nikita

The Blender Python API provides add-on developers with quite a wide range of options for designing a user interface. However, sometimes the built-in capabilities of the Blender API may not be enough. We can create a window with a UI that is completely independent of the built-in API by connecting and using the PySide module.

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Getting the active property value in Blender using context

Nikita

To get the current active object in a Blender scene, we usually use the context and its context.object (or context.active_object) property. Similarly, when working with the interface, we can access the context to get the currently active property – the value of the field in the Blender UI over which we hover the cursor or on which we clicked with the mouse. The context.property value is used for this.

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Quickly renaming data blocks to match object names in Blender

Nikita

When we assign or change the name of an object in Blender, we work at the object level. However, all objects also have a data block – a pointer to the actual object data, which also have names. The name of the data block can be seen by clicking on the corner arrow to the left of the object name in the outliner.

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Assigning real indices to vertices created in bmesh

Nikita

When we work with the bmesh object through the Blender Python API to create new geometry, all created vertices receive an index equal to -1. Although we can fully interact and control the created vertices, the lack of a numbered index can make it somewhat difficult to perceive the geometry and debug the code.

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Blocking the UV elements from moving beyond the UV area boundaries

Nikita

In most cases, UV elements (vertices, edges, faces, islands) can be freely moved anywhere in the UV Edit area. However, sometimes it is undesirable to move the UV beyond the boundaries of the base UV borders, for example, to ensure that the UV does not “move away” when baking it into atlases.

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