To work with geometry in Blender using the Python API, it is often necessary to find the center point of a polygon. This may be necessary for organizing various bindings, aligning objects along a polygon, positioning, and in many other cases.
We may need to get the rotation matrix from one vector to another in 2D space, for example, when working with UV maps. This is often necessary to adjust one UV island to another.
The rotation matrix from one vector to another in 2D spaceRead More »
To sort the list of materials in the object’s material slots in Blender in the desired way, for example, alphabetically, we can use the function we created earlier to switch materials in material slots.
Sorting materials in material slots alphabeticallyRead More »
To move a material from one material slot to another, we can click the up or down arrow button in the object’s material panel. In this case, the material in the currently selected slot will move up (or down) by one position. This method of moving and sorting materials is very slow and not very convenient.
Moving a material from one object material slot to another in BlenderRead More »
In order to completely select or deselect the entire mesh, it is not enough to change the selection only for its vertices, we also need to change the selection for the edges and polygons of the mesh.
Selecting and deselecting in bmesh only by verticesRead More »
When modeling “by reference”, it is sometimes necessary for the 3D scene grid to be displayed on top of the reference image. This makes it easier to snapping and relate the model being built to the scene as a whole.
When rotating or moving an object using transformation matrices, in some cases we need to be able to extract a part of it from the entire rotation/movement. For example, when rotating an object by 180 degrees, we need to rotate it not at once, but in several steps, each time rotating it by 30 degrees. Linear interpolation of matrices can help us with this.
How to get a partial transform matrix from an existing oneRead More »
In order to compare two vectors – to determine whether both vectors point to the same place, we need to compare the coordinates of both vectors and if they are equal, then the vectors are also equal. However, the coordinates of the vectors are specified by float values, the comparison of which for equality, due to the peculiarities of storing this type in computer memory, is never accurate.
From the math course, we know that only one circle can be drawn through any three points in space. So, if we have three points in a Blender scene, defined by the coordinates V0 (x0, y0, z0), V1 (x1, y1, z1), and V2 (x2, y2, z2), let’s see how we can construct a circle that passes through these three points.
Aligning one plane to another is a common task in 3D modeling. The easiest way to align planes is by using their normal vectors – we need to rotate the original plane so that its normal vector coincides with the normal vector of the plane for which the alignment is performed. Therefore, the task of rotating one plane to another can be reduced to the problem of rotating the normal vector of the first place to the normal vector of the second plane.
Calculating a rotation matrix from one vector to anotherRead More »
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