Questions tagged [vertex]
In geometry a vertex is a point defining the corners of polygons or intersections of lines. A triangle for example is defined by 3 vertices with lines between them. In 3D-graphical APIs like OpenGL and Direct3D a vertex is a data structure containing information about the positions, normals, colors, tangents etc of the points defining the triangular faces of 3D-meshes.
194 questions
0
votes
0
answers
44
views
OpenGL vertex normalization issue on MAC OS;
I am trying to learn OpenGL and this is my attempt to create a hello triangle program but no matter what the vertices are not normalized I when I have the set to 1,0,0 or something the vertex is not ...
0
votes
1
answer
51
views
Load vertexes from an obj file
I do have a problem with loading my vertexes.
When I debug my code. I find out the vertexes are loaded. But when i use render doc, I found out the vertexes are not loaded. Only the first line of my ...
- 11
0
votes
1
answer
113
views
How can I calculate vertex positions for a rectangle outline using a unit square, vertex normals, model matrix and outline thickness?
I'm trying to draw a hollow rectangle (i.e. the border of a rectangle without the middle) using a unit square plus normals. The actual positions are being calculated in my vertex shader.
For example, ...
- 123
1
vote
0
answers
53
views
I can't create a cube with mine vertaxes
i need some help with mine vertexes. when i long story short when i implemented mine class for projection matrix. i got a shape that is not cube that i had. I have googled little bit and i find it out ...
- 11
0
votes
1
answer
68
views
Vertex sorting to match triangle list definition of an hexagon
I’m working on a project to display molecules with DirectX that I’m updating regularly to add visual effects. The one I’m working on is simple: display a flat transparent hexagon that match a ...
- 159
0
votes
1
answer
635
views
Change Mesh face colors / materials at runtime
I'm trying to change the color/material of the faces on my object at runtime. My object has a default SpatialMappingWireframe to begin with:
And I'm trying to assign new colors on start like so:
<...
- 141
0
votes
1
answer
229
views
GameObject mesh.vertices array is empty
I've an Icosphere GameObject:
I want to iterate over each of the faces and change the material based on their distance from the center, however I don't seem to be able to retrieve the list of ...
- 141
2
votes
1
answer
3k
views
What is the use of multiple vertex color sets
I noticed that Assimp supports meshes with multiple vertex color sets, but what is the use of multiple vertex color sets? I mean are multiple vertex color sets are really used in any games, and if yes,...
- 1
0
votes
1
answer
226
views
Godot: how to get rid of color border in linear gradient texture 2d
Im trying to use a linear gradient to displace a plane mesh via vertex displacement in the visual shader editor. However the linear gradient always seems to drop back to the start color at just before ...
- 101
0
votes
1
answer
307
views
Vertex displacement shader graph shows unexpected creases at the beginning and end of a gradient texture
I'm trying to perform a basic vertex displacement by means of a horizontal gradient:
I'm using an on-the-fly created plane mesh. Most of this process is clear to me. I'm not understanding where the ...
- 101
0
votes
1
answer
175
views
Problems with reflection angles during collision resolution between circle and rectangle vertices (2D)
I'm having a hard time trying to resolve the reflexion angles when the ball collides with one of the brick's corners (square vertices) in my brick breaker game.
The collision detection system is ...
- 13
1
vote
2
answers
226
views
D3D11 Indices are Messed Up and Doesn't Follow my Primitive Topology
I am attempting to create a cube but I have been stuck on this for a very long time to no avail.
My results look like this:
All of my indices are messed up! Some are connected to the wrong vertices ...
- 150
1
vote
1
answer
1k
views
Vertex color values are not smoothly transitioning/interpolating in Godot shader
I'm trying to write a shader for terrain that will color the mesh based on slope angle, ie color the sides of mountains or other steep surfaces a different color than the ground. In my shader I am ...
- 31
1
vote
1
answer
67
views
Get local position of a skinned vertex
I have a formula for skinning, where a vertex is attached to 2 joints with some proportions:
B = M1*A*K1 + M2*A*K1
Where:
K1 and K2 are the proportion ...
- 13
4
votes
1
answer
6k
views
What is the purpose of tangent and bitangent vertex attributes?
Every vertex of a 3D mesh has position and some optional values like texture coordinates, vertex color, and normal, but also tangent and bitangent vectors.
While the purposes of texture coords, vertex ...
- 1
0
votes
1
answer
165
views
Interpolate colors between vertex in a plane
So I have this plane generated with two different Perlin noises. It has mainly 3 regions, divided by color. I want to smooth out the lines, to create a "gradient" so there are no abrupt ...
- 5
1
vote
1
answer
561
views
Having trouble implementing edge collapse operation with half-edge data structure
I'm trying to make a half-edge data structure to interact with meshes in 2D space in Unity but I'm having trouble with implementing an edge collapse operation that merges one vertex into its twin half-...
- 21
1
vote
1
answer
173
views
How do I get a range of vertices/edges using a half-edge data structure?
I have a half-edge data structure in 2D which loops through edges in a triangle in a clockwise order. I'm trying to get a range of vertices within a target vertex. Let's say I want all vertices within ...
- 21
5
votes
1
answer
473
views
I want to cut a pizza slice out of a 2D circle using mouse input in Unity. What data structures and geometric formulas would be best for this?
I understand this is probably not an easy task considering I haven't found any code examples online that do something like this but if I wanted to take in mouse input lets say during a drag and use ...
1
vote
0
answers
58
views
Problem detecting outer edges properly when deforming mesh dynamically
I've been using this edge code (https://answers.unity.com/questions/1019436/get-outeredge-vertices-c.html) for detecting outer edges.
...
1
vote
0
answers
304
views
How do I cut mesh partially with EzySlice?
I'm using the EzySlice framework to cut meshes (https://github.com/DavidArayan/ezy-slice).
So far it can cut a mesh but infinitely but I want to be able to cut partially like this:
As you see in the ...
- 11
0
votes
1
answer
938
views
How do I make sure the order of my vertices are always clockwise when creating new triangles?
In 2D I'm trying to insert a new vertex in my mesh and creating new triangles using that new vertex sort of like the red vertices in the picture shown:
However, I'm having trouble with figuring out ...
0
votes
0
answers
130
views
How can I distort a 2D mesh when moving one (or more) vertices?
I use Blender to show examples. I want to do this in Unity on runtime.
The outside corner vertex will be moved passed edge and the triangles appearance will be messed up like it shows on the second ...
- 1
0
votes
1
answer
56
views
Why does my deformed mesh's outer shape look awkward when none of the inner mesh vertices seem to be moved passed the outer vertices?
I'm trying to deform my mesh but the vertices cause these straight edges to occur where the inner mesh passes the outer mesh and create an awkward shape.
Why does the orange outline of the mesh not ...
- 11
1
vote
2
answers
87
views
How do I distinguish edge vertices?
I'm trying to displace the vertices highlighted in red but the way I'm selecting the vertices for displacement is by a distance radius based on the position I click with my mouse and I end up ...
- 11
0
votes
0
answers
56
views
Having problems with mouse drag mesh vertex deformation in 2D
This is in 2D space. I want to create a mouse dragging mechanic like the one shown in the picture where I find a range of vertices relative to the position I first clicked where the red vertices have ...
- 11
0
votes
1
answer
338
views
How do I find the correct vectors perpendicular to a vector in between two vertices?
I'm trying to push the purple vertices inward by moving it with a vector perpendicular to the red vector shown in the picture.
Each directional vector created will move its respective vertex towards ...
- 3
0
votes
1
answer
387
views
OpenGL Vertex Shader "joint matrix * weight" multiplication performance
Trying to implement animation on my engine.
I'm at the first stage, rendering default pose of skinned meshes.
Working as expected but very slow.
With the below calculation, the shader takes 6ms to run....
0
votes
0
answers
433
views
How can I roll up a plane like paper?
Hello, I want to twist the plane. The plane looks like this when I try to do it the way I linked below.
How can I my plane roll like photos?
How can I roll up a plane with a vertex shader?
you can see ...
1
vote
1
answer
483
views
What does 'vertex splitting' mean?
In the documentation of MeshUtility.SetPerTriangleUV2 it is said the following:
Will insert per-triangle uv2 in mesh and handle vertex splitting etc.
What do they mean by 'vertex splitting' ?
- 815
1
vote
1
answer
109
views
How to handle normal vector when duplicating vertex?
I'm currently developing a UV mapping, such as the UVW Map Modifier in 3ds Max (Not Unwrap UVW Modifier).
I split the vertices of the model in the form of a primitive shape (Box, Plane, etc.) and set ...
- 13
5
votes
1
answer
11k
views
How to randomly generate biome with perlin noise?
I want to generate a procedural world using perlin noise. As expected, my terrain is generating with a repetitive patern. I'd like to add biomes, zones separated with higher or lower amplitude to ...
- 322
0
votes
1
answer
77
views
Generate plane with script missing triangles
I am trying to do a simple script to generate a plane from a script by creating a new mesh. After trying it, it seems like some of the triangles aren't showing up. I checked if they were in the list ...
- 322
0
votes
1
answer
425
views
Position sprite vertices in 3D to conform to terrain
Rookie here, still learning the basics of Unity.
I've been using a quad as a cursor sitting flat on top of a hilly terrain mesh. I've been getting the terrain angle by raycasting down at all four ...
- 15
1
vote
1
answer
289
views
Calculate UV sphere vertices (altitude)
There is an fantastic answer by DMGregory here where he explains how to calculate and generate the vertices of an UV Sphere: OpenGL calculate UV sphere vertices
Based on his code, how can we change ...
- 121
0
votes
0
answers
228
views
Converting vertices to block coordinates
Sorry if this is the wrong place to ask this, please do tell me where a question like this is better asked.
Im importing a model from another game into the video game minecraft, which uses a ...
0
votes
1
answer
212
views
How do I create and animate simple polygons directly from code in Unity?
I'm a beginner with Unity, but I know how to code. I'm open to tutorials, of course.
Ideally, I would like to code spacial vertices and connect them into a simple polygon. The polygon would then be ...
0
votes
1
answer
50
views
Figure out why vertices are clipped
I am trying to figure out why, at sharp cutoffs in geometry, some vertices seems to be culled for some reason.
I have a heightmap for demonstrating it like this
And this is the result I get
See the ...
- 1,464
1
vote
1
answer
2k
views
Unity Vertex Color Shader with Transparency
I'm trying to achieve a simple effect: I have a cube mesh and I want some of the vertices to change color. In this case, I want it to form some sort of a gradient where the unchanged vertices are set ...
- 265
1
vote
1
answer
2k
views
When does it make sense to use Index Buffers?
The concept of Index buffers is that certain vertices are shared across faces, hence can be reused to save space of duplicated verticies. A vertex is usually more than 12 bytes (depending on the ...
- 544
0
votes
1
answer
122
views
Vertices in index buffer not rendered
I'm beginning with the 3D rendering in Monogame and i'm facing not a real issue because i already find a way to bypass it but more of a question.
I'm rendering a simple cube with 8 vertices like that:...
- 177
2
votes
1
answer
3k
views
Programmatically generated mesh vertex colors not showing up in Unity?
I'm sorry if this is an obvious thing to solve but I just can't figure it out...did I miss something...I've generated a mesh and during vertices generation I've also set its colors (and colors32 just ...
- 33
1
vote
1
answer
332
views
XNA 4.0 How to combine triangles vertices 3D
Preview for the problem:
I'm making a similar game to Minecraft (a game that it's world is made by cubes), but the fps of the game is getting low only by rendering a little amount of cubes in the ...
- 13
0
votes
0
answers
129
views
Generating skeleton bind pose from vertex weights
Assuming that you know how many bones should be in the skeleton, and you have the bone hierarchy, is it possible to calculate the bind pose of the bones just based on the vertex weights?
To elaborate ...
- 1
3
votes
1
answer
161
views
How to inflate geometry?
I have a shape containing vertices and triangles
I want to inflate that geometry using some radius to get something like that
I should move each point along ...
- 163
1
vote
1
answer
1k
views
How can I reorder the order in which the vertices are in an .obj file?
Blender saves the files with the structure of
All the vertices
All the normals
All the UV
The game to which I want to import the model, only accepts the following order in structure
1 vertex
1 ...
5
votes
4
answers
7k
views
Algorithms for calculating vertex normals in 2D polygon
I have the points of a 2D polygon in the order in which they are connected, and I need to calculate the vertex normals and move them along it. An example is shown.
I would like to know how to ...
- 153
3
votes
2
answers
3k
views
How can I convert my list of vertices and indices to a list of triangles?
I have a full 3D collision mesh that is represented by a list of vertices and another list of indices. I need to convert the list of vertices and the list of indices into a set of triangles.
First I ...
user116458
0
votes
1
answer
3k
views
Removing duplicate vertices on a mesh
I have a set of vertices and another set of indices. Sometimes I find that I have duplicate vertices in my mesh.
I tried at first to check if two identical vertices were in the array of vertices but ...
user116458
0
votes
1
answer
206
views
Issues to display a texture loaded with libPNG with opengles 3.0
I'm trying to load a texture loaded with libPNG on a XY coordinates. I know the width and the height of the texture (32x32).
The texture is already loaded successfully and I have his Id.
Here is my ...
- 111