Sphere Texture Mapping shows visible seams

Posted by AvengerDr on Game Development See other posts from Game Development or by AvengerDr
Published on 2014-05-31T13:49:58Z Indexed on 2014/05/31 16:05 UTC
Read the original article Hit count: 350

Filed under:

textures

|

hlsl

|

uv-mapping

As you can see from the above picture there is a visible seam in the texture mapping. The underlying mesh is a geosphere based on octahedron subdivisions. On that particular latitude, vertices have been duplicated. However there still is a visible seam.

Here is how I calculate the UV coordinates:

float longitude = (float)Math.Atan2(normal.X, -normal.Z);
float latitude = (float)Math.Acos(normal.Y);

float u = (float)(longitude / (Math.PI * 2.0) + 0.5);
float v = (float)(latitude / Math.PI);

Is this a problem in the coordinates or a mipmapping issue?

© Game Development or respective owner

Related posts about textures

Textures on top of other textures when using VBOs

as seen on Game Development - Search for 'Game Development'
I'm currently making a cube style game. With chunks being drawn with VBOs. I'd like to know if there is a way to create an overlay texture on top of the existing texture without the need to rebuild the VBO. This is required to show activity in a cube (think of Minecraft when destroying a block and… >>> More
Texture switching with a entity system

as seen on Game Development - Search for 'Game Development'
I'm using thinking of using an entity system in my game. So far I've been using Artemis with success. However, I have a question about texture switching. I read that switching textures too often is bad. So I load all the textures when the game loads like so: import org.newdawn.slick.opengl.TextureLoader; … >>> More
SFML: Generate a background image

as seen on Game Development - Search for 'Game Development'
I want to generate a background, which is used in the game, on every instance of the game based on certain conditions. To do so, I'm using a sf::RenderTexture and a sf::Texture like this: sf::RenderTexture image; std::vector<sf::Texture> textures; sf::Texture texture; // instantiating the vector… >>> More
Unity: how to apply programmatical changes to the Terrain SplatPrototype?

as seen on Game Development - Search for 'Game Development'
I have a script to which I add a Terrain object (I drag and drop the terrain in the public Terrain field). The Terrain is already setup in Unity to have 2 PaintTextures: 1 is a Square (set up with a tile size so that it forms a checkered pattern) and the 2nd one is a grass image: Also the Target… >>> More
SDL2 sprite batching and texture atlases

as seen on Game Development - Search for 'Game Development'
I have been programming a 2D game in C++, using the SDL2 graphics API for rendering. My game concept currently features effects that could result in even tens of thousands of sprites being drawn simultaneously to the screen. I'd like to know what can be done for increasing rendering efficiency if… >>> More

Related posts about hlsl

A Quick HLSL Question (How to modify some HLSL code)

as seen on Game Development - Search for 'Game Development'
Thanks for wanting to help! I'm trying to create a circular, repeating ring (that moves outward) on a texture. I've achieved this, to a degree, with the following code: float distance = length(inTex - in_ShipCenter); float time = in_Time; ///* Simple distance/time combination */ float2 colorIndex… >>> More
Issues with HLSL and lighting

as seen on Stack Overflow - Search for 'Stack Overflow'
I am trying figure out whats going on with my HLSL code but I have no way of debugging it cause C++ gives off no errors. The application just closes when I run it. I am trying to add lighting to a 3d plane I made. below is my HLSL. The problem consist when my Pixel shader method returns the struct… >>> More
Offloading to HLSL/GPU without displaying?

as seen on Stack Overflow - Search for 'Stack Overflow'
As far as I know, certain mathematical functions like FFTs and perlin noise, etc. can be much faster when done on the GPU as a pixel shader. My question is, if I wanted to exploit this to calculate results and stream to bitmaps, could I do it without needing to actually display it in Silverlight or… >>> More
HLSL, Program pixel shader with different Texture2D downscaling algorithms

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to port some image interpolation algorithms into HLSL code, for now i got: float2 texSize; float scale; int method; sampler TextureSampler : register(s0); float4 PixelShader(float4 color : COLOR0, float2 texCoord : TEXCOORD0) : COLOR0 { float2 newTexSize = texSize * scale; float4… >>> More
Using SurfaceFormat.Single and HLSL for GPGPU with XNA

as seen on Game Development - Search for 'Game Development'
I'm trying to implement a so-called ping-pong technique in XNA; you basically have two RenderTarget2D A and B and at each iteration you use one as texture and the other as target - and vice versa - for a quad rendered through an HLSL pixel shader. step1: A--PS--B step2: B--PS--A step3: A--PS--B … >>> More