# Tagged Questions

The 3D modelling process of making a 2D image representation of a 3D model, although it is typically used to refer to mapping textures to 3D objects. It is especially used in games as it is an efficient and compact way of texturing objects.

1k views

### 3D position to UV coordinates in fragment shader

I am interested in converting an arbitrary 3D position computed at run time in the fragment shader to its corresponding UV coordinates. Notice that the 3D position I am interested in is NOT a 3D ...
405 views

### UV interpolation is wrong with a wide FOV

How should I take FOV into account when interpolating UV coordinates? This picture shows the result today. Everything works fine with a narrow fov, but when I make it really wide, things deviate. The ...
690 views

### Unity : shader that uses mesh.uv to tile texture atlas and mesh.uv2 to tile light atlas

I'm using a texture atlas and a light atlas to tile a mesh. I have the texture atlas working fine. I can apply textures and create a sort of tile map on my coded mesh. At the moment I'm using the ...
1k views

### Unity UV map, tint / change color of texture

I have an array of vertices with texture coordinates for a UV map in Unity: newUV.Add(new Vector2 (0, 1)); // FACE 1 newUV.Add(new Vector2 (1, 1)); newUV.Add(new Vector2 (1, 0)); newUV.Add(new ...
197 views

### How can I adjust the UVs of my quad so my texture isn't flipped?

My sprite geometry is reversed using matrix so that it is in the XZ plane. This results in the image used for the sprite to also be reversed, which I don't want: (source : http://www.badlogicgames....
6k views

### How to compute tangent and bitangent vectors

I have a texture loaded in three.js, then passed to the shaders. In the vertex shader I compute the normal, and I save into a variable the uv vector. <script id="vertexShader" type="x-shader/x-...
183 views

### Wrong UV mapping when using small textures and positions

I am using a really small texture (64x64) and when I use it as a UV map on my mesh, there are some incomplete lines from the color of the other side of the UV map rendered as well (in this case, white....
2k views

### What are some ways to texture map a terrain?

I'm working with XNA on a 3D Game, and I'm trying to have a proper and nice environnement. I actually followed a tutorial to create a terrain from a heightmap. To texture it, I just apply a grass ...
268 views

### Rasterization Rules and States

This thread directly concerns lightmap generation; however, indirectly, the rasterization of polygons by the GPU. I am currently generating lightmaps using a pixel shader. To the shader I send 3 ...
679 views

### Finding Pixels within UV Coordinates

I am building lightmaps for 3D models. My lightmap algorithm needs to determine which pixels( lumels ) within the lightmap texture fall within the boundary of a mesh face( triangle )...this process ...
156 views

### Generate complex (non-convex) polyhedron UV mapping

I need to find an approach to the problem of generating texture maps for non-convex polyhedrons without using a design tool like Maya. Specifically, I am mapping simulation results data onto a 3D ...
408 views

### UV Coordinates of “curve” (or “bend”)

I am looking for some tutorial or equation how to map texture from square to "curve" or "bend". (Example on image below) I have tried to convert coordinates of unit circle to UV, but that gives me ...
113 views

### Variable sized cube texture stretching problem

I have a 1x1x1 cube made in Blender with a simple UVW mapping. It represents a 3D platform of variable size. The thing is that this cube gets resized a lot, and I want to draw a "border" of a fixed-...
750 views

### UV Atlas Generation and Seam Removal

I'm generating light maps for scene mesh objects using DirectX's UV Atlas Tool( D3DXUVAtlasCreate() ). I've succeeded in generating an atlas, however, when I try to render the mesh object using the ...
6k views

### Texture atlasing in Unity

I'm researching new ways to optimize games for better performance. Currently I am working on texture atlasing, which is giving me a hard time. I made the atlas using Texture2D.PackTextures and saved ...
222 views

### Texturing spherical terrain, seemingly arbitrary distortion

I'm using this algorithm to find texture coordinates on a sphere: Wikipedia UV Coordinates I get the famous seam due to the wrong interpolation, but I also get odd distortions on certain points on ...
99 views

### Organize different layers of repeating texture

I'm using Blender for creating assets for a 3D video game (FPS). Particularly i have to create a long wooden fence and i'd like to use one 700*700 texture for the entire fence so different part of ...
575 views

### UV mapping: Untextured faces?

Im currently trying to texture a (transparent) cylinder. I want the texture image to wrap sideways around the cylinder but not the top and bottom faces, they are supposed to just stay untextured (so ...
1k views

### Computing uv coordinates on a sphere approximated from an octahedron

Right now I'm texturing the octahedron with the formular from wikipedia(Finding UV on a sphere): UV Coordinates Wikipedia That unfortunately leads to heavy distortion right at the beginning, which of ...
2k views

### Texture mapping issue in my Wavefront *.obj parser

I wrote a simple *.obj parser reading read vertices, texcoords and normals. But when I draw a model the texture isn't mapped correctly. I have already tried uv.y = 1.0f - uv.y to get inverted Y axis ...
3k views

### How to texture a surface generated by marching cubes algorithm?

I'm working on a voxel game, and I have some problems with texturing. I have read the related questions on this stack exchange, but they seem adressing a generic problem (using triplanar texturing), ...
271 views

### Getting UV maps from UDK?

I have created a map using UDK and I am exporting it as a .fbx for use within an XNA project. My question is, can I generate a UV map for texturing the map or is there an easier way to texture a map ...
441 views

### Does this UV mapping method look ok? [closed]

i'm having a spot of trouble trying to get my voxels textures in the right place. I am using a very simple mechanism that assumes all sides of any given block are always individually specified (i'll ...
7k views

### How can I prevent seams from showing up on objects using lower mipmap levels?

Disclaimer: kindly right click on the images and open them separately so that they're at full size, as there are fine details which don't show up otherwise. Thank you. I made a simple Blender model, ...
149 views

### UV Mapping Problems

I'm creating an alien in blender, doing my best to base it on the guys from toy story. When I create the UV Map and colour it, import it back in then take a look at it in a seperate window there is ...
250 views

### Skeletal Animation with UV seams

I have a UV-mapped model that I am about to animate and load into my game. Like most unwrapped models, I have several UV seams. In order to render the model correctly, I split each vertex along the ...
102 views

### Blender 2.6: UV-Matching on Non-Image-Textures

Situation: I want to model a piece of wood in Blender (2.63.0). In order to do this I use a set of Noise and Clouds textures on a brown material. But these textures are warped and shown in the wrong ...
1k views

### Texturing an asteroid

I'm trying to texture this asteroid so it looks reasonable. I'm missing something though. Following this tutorial, I got this so far. Now I don't understand the next step: how do you resolve the ...
1k views

### UV texture mapping with perspective correct interpolation

I am working on a software rasterizer for educational purposes and I am having issues with the texturing. The problem is, only one face of the cube gets correctly textured. The rest are stretched ...
272 views

### How would you UV unwrap an octahedron?

I tried to UV unwrap this octahedron, by slicing one of the sides. I was able to lay it out on the texture like this, but with severe distortions. Can someone help me UV map this without ...
539 views

### How would I get this to UV map correctly?

Alright so I have my code to draw out a big landscape using C++ and DirectX. I had it textured with one texture and then needed to add more. I saw people doing it where they had 1 texture image and ...
218 views

### Blender move single UV point [closed]

Texturing in Blender and when I am moving UVs around in the UV/Image Editor I'm finding that I can't move a single UV point without moving all other UVs that are connected to the vertex. This seems ...
229 views

### What uses are there for multiple UV maps on a model?

I'm trying to think of some reasons why there might be more than one UV map on a mesh. Usually I just unwrap the model, and the same UV map works for both the diffuse color texture, the bump map ...
557 views

### UVW Unwrap multiple quads on same texture space automatically

I've been looking around the web for the answer to this question, but to no avail. So here I go. I'm looking for a way to automatically map several quads on the same texture space (for example (0,0) ~...
437 views

### Why does multiplying texture coordinates scale the texture?

I'm having trouble visualizing this geometrically - why is it that multiplying the U,V coordinates of a texture coordinate has the effect of scaling that texture by that factor? eg if you scaled the ...
2k views

### Exporting UV coords from Blender

So I have searched on google and various other websites but I've not found an answer. The only ones I did find did not work. So my question is how do I get UV coords from blender (2.63)? Currently I'...
508 views

### Automated texture mapping

I have a set of seamless tiling textures. I want to be able to take an arbitrary model and create a UV map with these properties: No stretching (all textures tile appropriately so there is no ...
3k views

### How to correctly export UV coordinates from Blender

Alright, so I'm just now getting around to texturing some assets. After much trial and error I feel I'm pretty good at UV unwrapping now and my work looks good in Blender. However, either I'm using ...
150 views

### Map displacement transformation to texture space?

I am trying to displace geometry in object space without giving the appearance of texture warping. My idea is to displace the UV lookup by a relative amount to the geometry displacement. Any ...
1k views

### Optimizing UV Map Sheet Based On Surface Area?

I am trying to get my UV Map Sheets Optimized Based On Surface Area , I need Them optimized cause my scene area is huge and i want to use them in UDK so i am trying to get maximum possible ...
764 views

### Trouble with UV Mapping Blender => Unity 3

For some reason I am getting nasty grey edges around the edges of rendered 3D models that are not present in Blender. I seem to be able to solve the problem by reducing the size of the UV coordinates ...
2k views

### Multi texturing in XNA

I am attempting to make a map editor for my game, just so I can visualize how the end result would be. To my world I can add cubes (2 triangles) or corners (1 triangle), which are then added to a ...
767 views

### XNA UV Mapping flipping the Texture every second time

I am making a tile based game. Recently I moved to drawing tiles as primitives to speed up things and also allow for easier lighting (Vertex Shader). I then took it a step further and made some ...
1k views

### Drawing a textured triangle with CPU instead of GPU

I understand the benefits of GPU rendering and such, but for a certain limited application I need to render textured triangles purely using CPU. I've built a 3D engine capable of object handling, ...
570 views

### Programmatically determine UVs by rotating a plane along X axis

I'm having a math brainfart while trying to solve what might be a simple problem. I've got a plane in 3d space (it's actually the face of a 10-sided die): Coordinates [x,y,z]: Point_top = [0,0,1] ...
4k views

### How does UVW texture mapping work?

I'm trying to understand the mathematical theory behind UVW mapping. Can anyone explain me how UVW mapping works? Or at least provide me a pointer?
2k views

### Interactively edit UV mapped, textured mesh in Cinema 4D without distorting texture?

I'm fairly new to Cinema and I'm building a rigged flat (2d) character out of illustrated pieces. I want the meshes to have an efficient number of polys but sufficient resolution where they'll bend ...
1k views

### Mapping rectangular texture on trapezoid-like shape

I have a problem with rendering rectangular textures on non-rectangular surfaces. While googling, I found a thread with person having a pretty similar problem: http://www.gamedev.net/topic/419296-...
317 views

### What to do to UV coordinates, when swapping Z/Y coordinates (axis) of the geometry?

In my Maxscript exporter I have the ability to flip the Z/Y axis by simply swapping the Z and Y co-ordinates. When swapping the axis this way, what is the correct thing to do to the UV coordinates? (...
5k views

### Can't understand these UV texture coordinates (range is NOT 0.0 to 1.0)

I am trying to draw a simple 3D object generated by Google SketchUp 8 Pro onto my WebGL app, the model is a simple cylinder. I opened the exported file and copied the vertices positions, indices, ...