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Questions tagged [geometry]

Questions pertaining to creating, generating or editing an objects geometry. Object geometry is defined by editing and creating the location and rotation of vertices, edges, and faces.

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6 views

UV coordinate from ray_cast?

I want to get the UV coordinate of a point on the surface of an object. I want to automatically generate new textures for many objects based on code I have written. I was thinking I would call the ...
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1answer
24 views

How can I create dynamic brick/tile-like geometry?

I want to create something like this: The key requirements are: Must be actual geometry. I'm going to be 3d printing this, so I don't think using materials will help me here. Would like to be able ...
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2answers
61 views

Apply Transformation Matrix to Existing Mesh

How can I apply a 3x3 or 4x4 transformation matrix to a mesh such that the matrix's transformation is baked into its geometry? E.g. applying the following matrix... \begin{bmatrix} 1 & 0 &...
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1answer
34 views

Apply “backface culling” if the surface is not visible from the given point

Given the point (x,y,z) and meshes scattered around this point in the space, where each triangle on the mesh has its normal known, I want to be able to detect which triangles are not visible to the ...
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41 views

What happened to my straight lines in 2.8?

I modeled these letters in 2.7 no problem. I just brought them into 2.80 and the straight lines have this "back forth" look along the geometry. The normals are all outside, I tried to re-do the ...
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28 views

Disassemble this math function pseudosphere into circle strips or/and individual cones?

Is there a way to disassemble this math function into circle strips or/and individual cones? Irrespective of section number depicted. The idea is to print on paper and cut-out.
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2answers
105 views

Check if the whole plane is being on a orthographic camera render (or get a proportion of the rendered plane)

Situation: On my scene, planes can be positioned anywhere and I should not move them - I move around only camera. After positioning a orthographic camera with a script, I am not sure if the whole ...
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3answers
84 views

Is there a hotkey to subdivide geometry?

I’ve been following this tutorial for a model, and I’m wondering if there’s any hotkey to change an extruded plane (like it was done in the video) from this: To this: If not, do I need to use a ...
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1answer
21 views

Is there a tool to remesh an object such that it contains a specified number of vertices?

I am currently making a classifier for 3-D objects that uses vertex data as input, and I am using Blender to create a dataset of 3D objects. For the classifier, I need all the objects to have equal ...
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1answer
31 views

Triangle Question

I've noticed that in Object Mode, if you select an object it will tell you how many triangles are in the mesh. However, is there a way to highlight where they are? From what I can see, everything is ...
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1answer
51 views

How do I reduce geometry in mesh?

Over the course of modelling, my mesh has gained a bit too much geometry. If I use the Decimate modifier, it tells me I need to get rid of my Shape Keys, if I do that, the modifier messes up my UV ...
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2answers
281 views

Square - Octagon - Circle - Modelling puzzle

I'm trying to make a rubber mat that is basically a big flat cube with lots of little holes (cells). It makes sense to me to model each cell and use an array modifier to construct the overall mat. ...
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22 views

Which api/data structure does blender use to represent its meshes?

I am wondering which underlying data structure blender uses to represent its meshes. I tried going through the source code but answering that question myself is harder than expected.
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0answers
43 views

Is there a way to check whether a point is within the convex hull of an object?

I'm trying to calculate to what extent one object contains another in a blender scene. To do this it would be ideal to see if one object is contained in the convex hull of another. I realise there ...
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2answers
47 views

Anyway To Material Paint This Complex Geometry?

So what I want to do is material paint this middle part for a diffrent look, but the geometry is very complex, and I want to make it circular, and able to change in keyframes, so that way I can ...
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1answer
186 views

Convert any 3D Game mesh to OBJ for use in blender

There are few games that deliver it's own Development Kit so you can decompile and modify the game assets in this case the geometry of the models by converting them to a general geometry file format ...
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1answer
53 views

How to maintain right angles while editing a rotated mesh?

I'm trying to move an edge loop in a mesh that's not aligned to the global axis, but is supposed to have all right angles (since it was created from a cube). Even though I move the loop along the mesh'...
6
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1answer
298 views

Cones on a pointing out from a cylinder

I am very new to Blender to please excuse me if I might use the wrong terminology. I would like to coat part of a sphere will well packed cones. With this I mean that the cones will have two radii, ...
2
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1answer
59 views

Deforming a plane over a topology

I'm a newbie in Blender and I'm testing a numerical algorithm. However, I want to extract the topology distribution of some existing objects in the scene. In other words, I want a surface that ...
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1answer
137 views

Blender Guru Anvil Tutorial Base Problem

Ok, so I followed the tutorial pretty much to the letter. I was near the end of video 2. I deleted the bottom face and extruded it together with Clipping and Merge like he showed, then proceeded to ...
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3answers
109 views

How do I shift a vertex to establish a single, flat surface on a quad?

One thing that I've noticed when drawing quads is that, if a single surface cannot be established using the vertex arrangement (for example, if you add the default plane and raise a single vertex to 1 ...
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1answer
47 views

How can I fix these non-manifold edges (boundaries prior to remove doubles, non-contiguous after remove doubles)?

I am trying to create a ring for 3D printing. Part of the requirements for 3D printing is to not have any non-manifold geometry in your model. When checking whether I met this requirement, I found ...
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1answer
84 views

How can I manually fix nonplanar geometry?

I'm going through a course on blender. The course teaches blender through the use of several projects. Right now I'm modeling a low-poly chess set, and we've arrived at the knight. Because we made the ...
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0answers
51 views

Change from Yafaray to PovRay

I tried to switch the rendering engine from Yarafay v3 to PovRay v3.7. I attach two pictures below. The first one is rendered by Yafaray and the second one PovRay. I understand the color and lighting ...
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1answer
87 views

How can I thicken the walls of my model for a more sturdy 3D printing?

Good afternoon, I have been trying to print a 3D tile on my XYZ da Vinci 1.0 Pro 3-in-1, with Simplify 3D, but every time I try it seems that the lightness of the walls + the complexity of the inner ...
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3answers
859 views

Is there a “Volume Select” equivalent in Blender?

3D Studio has a modifier called "Volume Select" that allows using an element's geometry as a sort of selection force field that influences elements in its path. It can be used to transform many at ...
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1answer
94 views

How to make texture appear only in dark spots?

I'm trying to make a realistic earth but now comes the problem of the lights. Since I'd like to make an animation I want the night lights(which are just a texture with an emission shader) to "appear" ...
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0answers
103 views

Artifacts when rendering irregular mesh in Cycles (black lines)

when I render with Cycles any mesh (specially planes) with a bit of irregular shape (by using previously, for example, a displacement map) some black lines appear on it. Those black lines are not ...
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1answer
105 views

How to add a embossed/debossed logo to a curved surface?

I’m really having a hard time trying to emboss or deboss a logo / typography on a shape other than a flat plane. For example trying to get a logo on a curved bottle. I already asked something similar ...
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1answer
42 views

Keep edge loops in triangle face?

Look at this picture, I have to fill the empty vertices. The shape the face I have to fill is triangle. I can't keep edge loops after adding triangle faces, is there a way to avoid using triangle in ...
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1answer
54 views

Creating a polygon plane with different sections / components

I'm trying to build a polygon plane exactely as in this video at 5:28, but in Blender, not Maya. I haven't found any convinient way to do that. I select the edges and extrude it, but I don't think ...
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2answers
46 views

How to prevent Subdivision Surface from changing the size of a loop

I modelled this hole but when I turn SS on, it becomes too small. Adding geometry around it isnt an option, since I want everything to be as smooth as possible. Scaling it up doesnt work, because this ...
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0answers
23 views

Draw perpendicular extrudes by left button mouse clicking?

Blender has this cool feature where you can select an edge and left click anywhere on the grid to produce quick extrudes. However, the extrudes can't snap to a perpendicular ( 90° corners) shape. Is ...
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1answer
73 views

Finding neighboring mesh faces

I'm quite new to Blender and I'm trying to write my first Blender/Python script. I'm implementing an algorithm that is looking for the lowest (z-value) laying neighboring face for each mesh face. I ...
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3answers
1k views

Twisted Cylinder (Hyperboloid of one sheet)

I want to create a mesh like this: with a vertex on every edge-crossing so that every face is kite (nearly rhombus) shaped. The above image was created just by rotating the top of two cylinders in ...
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1answer
68 views

Can you turn a pose into the actual geometry of the mesh?

For example, I move the finger bones so it appears like a rested hand. Is it possible after that to make that pose the actual geometry of the mesh, so when I compile it and put it in game it doesn't ...
4
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1answer
181 views

Billions of loop cuts

Been modeling for 1.5 month now, and realized that my biggest struggle in every model are proximity loops cuts. Particularily in this model when I wanted to "cut-out" sound pickups (green) I had to ...
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1answer
34 views

How do you solve the issue with an object with subdivision and multiple materials on it?

I was making a charger and I have given it some subdivision as usual. Now one side of the charger has a bit different texture (less glossier to be specific) so I tried that in blender, but that ...
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1answer
41 views

Particles higher than geometry

i am having this issue, some particles are getting buried in the geometry and you can see only the tip of the object, is there a way to cast the particles a little bit higher than the geometry volume?
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2answers
47 views

How can I uniformly modify a pipe with coding?

I have a plain pipe with a center-line. I need to gradually decrease its diameter towards the end (to create a taper). I've been told that I should use some codes to scale the bones automatically. I ...
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0answers
12 views

How to Reduce geometry on multiple identical objects? [duplicate]

I have created a single sandbag, given it a texture and bones, copied it many times, stacked the sandbags, moved some bones to have some sand bags hang over, and given some of them a different color. ...
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2answers
42 views

How should you go around with geometry for Unity?

I'm confused. Can someone tell me which way is better (1 or 2)? 1. 2. 2nd is after using a limited disolve
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1answer
232 views

How to create good topology without changing the flow

Guys how do i make that top extrusion sharp without changing the flow of the lower part? I want the green area to be sharp but without those creases below.
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1answer
94 views

How to “Merge” a Mesh

So I have a mesh I downloaded, but it intersects itself. I would like it to be one large single shell instead of having various intersection areas. Like the edges would go through faces. The model isn'...
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0answers
226 views

Separate mesh into separate batches with python

I am working on an export / import addon for a custom model file format which stores its geometry in the so-called "render batches", the structures aimed at optimizing geometry for effecient live ...
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1answer
65 views

Trying to make a figure eight

So I was given a diagram for a lopsided figure eight. The figure eight can be made with two arcs and two tangent lines. I know the angle I'd need to cut out of a circle to make the arcs, and I could ...
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1answer
142 views

Bind and apply SURFACE_DEFORM modifier without bpy.ops?

Is there a way to bind a surface deform mod without running bpy.ops.object.surfacedeform_bind(modifier="Surface Deform") and is there way to apply it without ...
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3answers
508 views

Can we smooth selected faces to make curved surface more precise?

Is there a way to smooth selected faces to make curved surface more precise? This kind of mathematical accuracy is of course easier achieved by using nurbs oriented workflow, but it could be handy to ...
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1answer
875 views

How to connect a circle to a grid with even topology?

I'm trying to connect the pieces shown below together seamlessly, but I can't figure out the correct way to do it. I have tried a bit of everything, but nothing seems to give me the result I'm ...
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1answer
23 views

I am skinning a skewed quad with math

I have a quad v1, v2, v3, v4 I have a array (a subdivided patch of vertex) that is sorted so that [0][0] = v1 [0][8] = v2 [8][8] = v3 [0][8] = v4 I need to average the vectors to fill in the ...