# Tagged Questions

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,...

27 views

### How are the positions of skinned mesh vertices with multiple weighted parents stored?

I'm trying to wrap my head around the basics of skinning and skeletal animation. I understand not every skeletal animation implementation works exactly the same, but I'm just trying to understand the ...
264 views

### Vertex ordering with THREEjs's exporter

I'm using THREEjs's exporter to export a 2D polygon plane. The resulting JSON gives me the vertices. I'm trying to properly order these vertices as to make the actual polygon shape, without luck. ...
71 views

I'm a newbie in assimp and openGL. I'm trying to import .fbx or .dae formatted file to openGL via assimp. Importing skeletal animation was kind of easy. Lots of introductions and sample projects ...
84 views

### Process of writing to the depth texture

In openGL, let's say I output one single point from the vertex shader with this value gl_Position = vec4(2.0,3.0,5.0,7.0); what exact math operations happen to "z" after leaving the vertex shader? ...
187 views

### Point welding on generated terrain

I am converting two 2D images (A Voronoi graph and a Diamond Square noise map) into a 3D object. However when finding the corner points of the Voronoi I am left with gaps, so I thought to drop these ...
40 views

### How do I make my indices anti-clockwise, so I can cull triangles in OpenGL? (immediate mode)

At the moment, I'm attempting a basic game engine in OpenGL using immediate mode. I'm trying to render a cube. Cube is a class with the vertices, normals, and indices. Here is part of the Cube class: ...
25 views

### How to prevent object from moving when it's mesh/collider is being updated?

So I a made a script that lets the player grab a vertex, move it, and then update the mesh. To help prevent the player from trying to clip it through other objects I made it so the mesh/collider is ...
26 views

### DirectX 11 Vertex Shader Fragmentation

I was wondering how my vertex shader is causing my cube to be render weirdly? I am using the Visual Studio graphics tool and see that my input assembler is correctly receiving the cube and I can only ...
22 views

### How to apply individual colours in a fragment shader?

I'm trying to write my own shader. Within the target mesh I have assigned the following attributes in a script: mesh.vertices = points; mesh.colors = colours; //Each element of the array hold a ...
29 views

### Mesh/Path reduction to simulate traveled path to target

I generate that kind of mesh during runtime to display the path to follow to a target (think at something like the path your GPS shows you when you are travelling): I need to reduce the displayed ...
44 views

### indices for surface of revolution

I'd like to implement a surface of revolution. I already implemented creating Vertices based on a 2D line. I now want to get the indices to render the mesh with GL_TRIANGLES Here's the code to ...
1k views

### How do I create a manual object with colors for each vertex?

How do I create a shaded manual object with colours for each vertex? Eg if ogreObj is the Ogre::ManualObject : ogreObj->begin("BaseWhiteNoLighting", Ogre::RenderOperation::OT_TRIANGLE_LIST); ...
29 views

### How to get vectices of a sprite in correct order in Unity?

Currently, when I examine sprite.vertices, I see that it is ordered in crossed way, like: one from bottom, one from up, another one from somewhere else... etc. I need the correct order to make array ...
220 views

I'm writing a shader and I just wanna ask if it's possible to get the ID of the vertex that is currently being manipulated. I read something about gl_vertexID, but I couldn't find out if that is ...
2k views

### Why Does unity_LightPosition[0] Seem to Depend on Camera Position?

I'm trying to write a fairly basic shader but I keep running into lighting issues with Unity. My first problem was trying to figure out which variable stored the light's position in world space. (I'...
22 views

### JAVA lwjgl 3D Quadmap engine help

I've been trying to make a custom generated level engine that creates a custom flat surface. With my current knowledge of vertices and indices i have successfully created a rectangular surface. My ...
64 views

### Vertex position problem for connected lines

I’m trying to generate a mesh to display connected segments representing street lines in a mini map. I have problem with vertex orientation that my math knowledge has hard time to resolve. Let’s ...
140 views

### Why doesn't Array.Copy to mesh.verticies work in Unity?

I am rebuilding a mesh but something seems odd that I have to create a temp array just to hold the verticies rather than copy an array. I'm not using list because this is used frequently and I do not ...
90 views

### Avoiding GC when rebuilding Mesh.uv and Mesh.vertices

Since unity will not allow users to iterate over mesh.uv and mesh.vertices, I am stuck having to use GC intensive calls when applying an array of uvs and vertices to a mesh. I run into high GC ...
125 views

### Most efficient way to get the world position of the 8 vertexes of a Box Collider (C#)

What I am looking for is the most efficient way to get the world position of the 8 vertexes of the Box Collider of a freely rotated Gameobject. I cannot use collider.bounds since object is rotated, ...
41 views

### Detecting the two Vector3 that determine the bottom-edge of the side of a box-collider that had collision (with C#)

So, I understand that plenty of questions have been posted on how to detect which side of a Box Collider had collision. However, what I am trying to achieve is a little different. I want to find out, ...
33 views

### Weird warping with per-vertex normals

I've had this little problem for a while now, where for some reason my calculations for per-vertex normals results in a weird distortion or warping, skewing my lighting, shading, and reflection passes....
134 views

### Algorithm for triangle picking?

So i found out that i need a triangle picking algorithm, i need to see if my mouse is over the triangle. I've heard what color picking is, but it would pretty much just drop the performance twice (...
85 views

### How to determine vertex index using Shader Model 3 or lower?

I need something like SV_VertexId (added in Shader Model 4) in HLSL shader to determine which vertex is currently handled. Unfortunatelly, I can compile only vs_3_0 or lower. The objective is to ...
83 views

### OpenGL vertex data per index

Usually, vertex data is assigned to a particular vertex, like this: [data] [vertices] [1.31] -> [1, 13, 5] [84.3] -> [5, 8, 12] [.095] -> [8, 3, 10] Then, you would typically have an ...
1k views

### Geometry Shader not generating geometry for some Vertices

I am playing with a geometry shader and I am wondering why it doesn't generate geometry for each vertex in all meshes? I don't think this is a Cull problem because the same vertices generate ...
4k views

### calculate new vertex position given a transform matrix?

How can I get the new position of my vertex given a 4x4 transform matrix or simply 9 floats (positionX, positionY, positionZ, rotationH, rotationP, rotationR, scaleX, scaleY, scaleZ)? Usually I can ...
340 views

### Applying texture to a 3D object

I am trying to draw a 3D cube on the screen, using MonoGame. The cube was created in Blender and exported as an fbx file. The following is what the cube looks like in VS when opened in the editor: ...
540 views

### Shader that draws just vertex points

The game I am developing is in unity and I want to make a shader which can be put on a mesh that only 'draws' color on each vertex point. I am not proficient with shaders, and out of all my searching ...
29 views

### How to calculate per vertex normals? (OpenGL) [duplicate]

I am really confused and quite much thinking about how to do that? Cross product and then, normalizing is not working for me. Or perhaps, I take them all wrong. Well, please explain me that while ...
90 views

### Malformed/Pixelated Vertex Normals

I am trying to generate vertex normals for a given triangles/vertices list with the following code: **BASE METHOD:** private void CalculateNormals() { for (Int32 i = 0; i < m_Meshes.Count; ++...
328 views

### Disappearring instances of VertexPositionColor using MonoGame

I am a complete beginner in graphics developing with XNA/Monogame. Started my own project using Monogame 3.0 for WinRT. I have this unexplainable issue that some of the vertices disappear while doing ...
695 views

### Spritebatch Vertex shader world matrix change after each draw

I have a spritebatch where I draw some textures transformed in 3d space. The easy way was just Begin with the transformation matrix, draw, and end it right after. But that is silly, so I'm trying ...
35 views

### Specify Vertex Quality in OBJ File

I've got a program that prints OBJ files in the format # x y z r g b format opens with MeshLab only (http://meshlab.sourceforge.net/) v xVal yVal zVal rVal gVal bVal v xVal yVal zVal rVal gVal bVal ...
127 views

### Overlapping Vertex in DynamicVertexBuffer draw priority?

I am creating a voxel game, and I have recently run into an issue. My world is drawn by a DynamicVertexBuffer, which just consists of vertices for the blocks themselves. On top of that, I switch ...
435 views

### OpenGL ES 1.0 to OpenGL ES 2.0, I cant draw a square

I am learning open GL ES 2.0 and I just made 1 easy game for 1.0 I am following tutorials but I cant understand this thing In OpenGL ES 1.0 if I define a square that way: private float[] vertices = ...
150 views

### Invalid operation (1282) in GLSL vertex shader

My GLSL vertex shader works fine, but you if put a for loop inside or rename the uniform xxx to something else, it says the follwoing: Exception in thread "main" org.lwjgl.opengl.OpenGLException: ...
433 views

### why is glVertexAttribDivisor crashing?

I am trying to render some trees with instancing. This is rather weird, but before sleeping yesterday night, I checked the code, and it was in a running state, when I got up this morning, it is ...
84 views

### Good way to support multiple types of triangles? (C# XNA)

[this question is somewhat long. here's my question in a nutshell] I want to use multiple types of Vertex data types for my triangle, interchangeably. So if I have a generic type T private void ...
2k views

### XNA - Update vertices property stored in a VertexBuffer

I've a class that creates a cube using VertexPositionColor and these vertices are stored in a VertexBuffer. Now i would like to dynamically change the color of my vertices. In my class i have a ...
61 views

### Setup VertexPositionTexture array for a texture2D at a location

I am trying to adjust the following code to render a quad on a 2D texture at a specific location and specific size. Currently this code will render a fullscreen quad, which makes sense since the ...
204 views

### What limits the number of vertices the GPU can process per clock cycle?

I am currently experimenting with OpenGL to make my own game. I wrote some test code to see what are the limits of my GPU. I own a Geforce 840m. This essentially consists of a draw command ...
79 views

### Normalizing a homogeneous 3d point

As I've seen corruption in geometry, why is it a bad idea to normalize a homogeneous (divide by w) the vertex position returned from vertex shader? Update Vertex shader: // float4 pos : SV_POSITION;...
117 views

### Reasonable texture Formats for VertexTextureFetch in GL

Wich is a reasonable GL version that have support for vertex textures fetchs(VTF) in OpenGL ? (for example GL 3.0, 3.1, 3.3) What textures formats should I expect to be supported in average video ...
130 views

### How can I deal with vertex precision errors between terrain chunks?

I am using OpenGL to render the following scene, using vertex data from one of the map files of a popular MMORPG. The data is chunked and the pictured scene is made up of 256 (16x16) chunks. However ...
142 views

### Making multiple VertexPositionColor variables in the same class? - XNA

I have studying XNA on my spare time for about a year now and I could use some professional help on this issue. Any time given to my problem is appreciated. I have two VertexPositionColor variables ...
270 views

### Fragment Shader output type error

StackExchange! I've been working with opengl for a bit and I'm trying to finally load the shaders instead of having them inline. I'm having a ton of issues, though. As soon as I solve one, another ...
252 views

### How do I pass an object location into a vertex shader?

I am using Blender Game Engine. I want to create a large flat plane, and deform it locally near a moving object. So far (despite being a beginner at shaders) I've written a vertex shader for the ...