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1answer
35 views

How to calculate reflection vector from point sprite sphere?

So far I achieved building a cube map following this tutorial. Then I drew three points using glDrawArrays(GL_POINTS,0,3) and calculate the normals based on a sphere. To compute the incoming light ...
2
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3answers
167 views

How do reflections work for large flat surfaces?

I understand how reflections work for objects. A cubemap would be rendered around a certain point in 3D space, usually at the center of the object that the reflection is to be applied to, and that is ...
2
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0answers
175 views

Skybox rendering

I am sorry if this is trivial, but I got into OpenGL just very very recently. I am trying to render skybox (with cubemaps) and this is what I have done: Created a VBO with vertices positions (36 ...
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0answers
121 views

Problems texturing a sphere using a cubemap

I have a single problem which I've attempted two methods to resolve. Neither is giving me 100% results. I've read about 100 tutorials and looked at code but it's just not working out for me; I believe ...
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0answers
59 views

Is it possible to loop over an array of samplerCube/samplerCubeShadow using OpenGL/GLSL?

I try to manage a scene with several point lights. For the moment my program works perfectly with just one point light. So I have in my fragment shader the following uniform declaration: uniform ...
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1answer
123 views

Skybox: OpenGL texCUBE vs a textured cube

In OpenGL, the typical way that I've seen to set up a skybox using cubemapping is to create a cube in camera space, prepare a cubemap sampler with the appropriate six-sided texture, and then in the ...
2
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1answer
259 views

Irradiance cubemap to spherical harmonics conversion

What are advantages of using spherical harmonics instead of irradiance cubemap? Are there any common used methods for conversion?
5
votes
1answer
180 views

Why are cube map axes sometimes labelled incorrectly?

In both 3ds Max (which uses a right-handed coordinate system) and Unity (which uses a left-handed coordinate system), the cube map faces labelled "left" and "right" show the view facing the opposite ...
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vote
1answer
121 views

Understanding how texCUBE works and writing cubemaps properly into a cube rendertarget

My goal is to create accurate reflections, sampled from a dynamic cubemap, for specific 3d objects (mostly lights) in XNA 4.0. To sample the cubemap I compute the 3d reflection vector in a classic ...
3
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1answer
183 views

Using textureGrad for anisotropic integration approximation

I'm trying to develop a real time rendering method using real time acquired envmap (cubemap) for lightning. This implies that my envmap can change as often as every frame and I therefore cannot use ...
1
vote
1answer
135 views

Get the game state using Multithreading in Java Monkey Engine 3

I’ve been trying out Java Monkey’s multi threading recently via the wiki’s tutorial. Since I just wanted to test a prototype clinet, I made a program which creates some cubes using the ‘Cubes’ library ...
0
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1answer
183 views

GL_TEXTURE_CUBE_MAP min/mag filter problem

I found it hard getting min/mag filtering to work with cubemap texture. In the screenshot-attachment I've created a cube using a cubemap texture, and also a grid of planes using a 2D texture. For both ...
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0answers
157 views

Drawing cube map and texture array on NVidia cards doesn't work

I have small problem with shadow maps preview. After binding shadow framebuffer I bind proper texture to store depth in it and then render the whole scene. When I read that values in shader to ...
0
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1answer
77 views

Texture errors in CubeMap

I am trying to apply this texture as a cubemap. This is my result: Clearly I am doing something with my texture coordinates, but I cannot for the life of me figure out what. I don't even see a ...
1
vote
2answers
339 views

Error while reading TGA file and doing Texture Cube map

In my program, i read a TGA file with a function like this: char* LoadTGA(char* filename, int* width, int* height, int* bpp); As you can see, this function: return a char array of image data ...
5
votes
1answer
3k views

Implementing a skybox with GLSL version 330

I am trying to get a skybox working with OpenGL 3.3 and GLSL version 330. I could not find a completely modern OGL skybox tutorial anywhere on the web, so I modernised an older one (using ...
2
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0answers
346 views

glFramebufferTexture2D gives corruption with cube map textures

I am using glFramebufferTexture2D with cube map textures but it gives corruption in texture. draw_cube() function works perfectly when i draw that on default framebuffer. GLenum ...
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3answers
2k views

Is a Single Texture Cube Map Possible?

I'm currently developing a test project to explore OpenGL 3 texturing abilities. I have a simple cube, made of 8 vertices and 36 indices. I want each of the cubes faces to have a different texture, so ...
0
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1answer
776 views

E_FAIL: An undetermined error occurred (-2147467259) when loading a cube texture

I'm trying to implement a skybox into my engine, and I'm having some trouble loading the image as a cube map. Everything works (but it doesn't look right) if I don't load using an ...
1
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3answers
563 views

How do you rotate a cube map?

I'm looking for suggestions on this Say you have a cube map. You want to rotate it as efficiently as possible. You can render the cube map, rotate the camera, and render the scene to another cube ...
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1answer
8k views

OpenGL/GLSL: Render to cube map?

I'm trying to figure out how to render my scene to a cube map. I've been stuck on this for a bit and figured I would ask you guys for some help. I'm new to OpenGL and this is the first time I'm using ...
1
vote
1answer
444 views

How do you create a fractal cube-map?

I want to create a map similar to how Mincraft and other related games do. I just haven't the faintest clue on how to do so. Can anyone point me to a decent tutorial or give me a decent run through? I ...
5
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2answers
453 views

Is a dynamic enviroment map using pincushion curvilinear perspective projection possible?

I'm wondering if it is possible to generate a dynamic spherical environment map using a single frame render using a pincushion curvilinear perspective projection matrix (phew, that's a mouthful)? ...
0
votes
1answer
924 views

OpenGL - resize texture when using cubemap

I want to resize my texture. I am using cubemap to compute reflection. I want to use this cubemap to draw skybox. Skybox is drawn but I want to resize texture down, because it is dilated. As I wrote ...
2
votes
2answers
3k views

How do I create a sky box with OpenGL ES 2.0?

Can you give me hint to any good sky box example in OpenGL ES 2.0? I have found only OpenGL and does not work for me. I am doing it this way: Initialization: glUseProgram(m_programSkyBox.Program); ...
2
votes
2answers
1k views

Can one draw a cube using different method/drawing mode?

I've just started learning gamedev (in particular android EGL based) and have ran over a code from Pro Android Games 2 that looks as follows: /* * Copyright (C) 2007 Google Inc. * * Licensed ...
17
votes
5answers
4k views

Procedural Planets, Heightmaps and Textures

I am currently working on an OpenGL procedural planet generator. I hope to use it for a space RPG, that will not allow players to go down to the surface of a planet so I have ignored anything ROAM ...
3
votes
2answers
837 views

Converting Cube Maps

I have cube maps in lat/long format, and i need to convert them to Horizontal/Vertical Cross, and individual cross images, is there an utility to do that?