13
votes
2answers
734 views

How can I simulate a limited (256) color palette in OpenGL?

On Twitter, I found this screenshot of a game in development: The image on top seems to be without any color limitation. But the two other pictures at the bottom have a 256 color palette. I want ...
0
votes
1answer
105 views

Why are some of my normals facing away from the camera?

I'm trying to use WebGL to render some simple models, and I'm running into issues where pixels near the edge of my model are passing normals to my fragment shader that point away from the camera. This ...
2
votes
1answer
132 views

How can I render a single object that uses multiple textures?

I'm looking for a technique to render an object with multiple texture sources. One texture is static, the other is generated dynamically (it's a render target). For example, say I was rendering a TV. ...
1
vote
1answer
165 views

WebGL immediate mode

I know that WebGL is based on OpenGL ES 2.0 and that glBegin and glEnd have been removed and replaced with vertex buffer objects. I understand that VBOs are faster and use less code but is there a ...
3
votes
1answer
421 views

Proper way to maintain Vertex Buffer Objects

I've started learning WebGL, currently I'm building a 2D lighting system, but there is some confusion going on inside my head. How the lighting works is based on this tutorial ...
3
votes
2answers
1k views

How to animate a model in WebGL?

I created a human model in Blender, exported the vertices and indices into a JSON file and render the model in a browser using WebGL. Now I created a walk and jump animation in Blender and would like ...
3
votes
2answers
440 views

What is UVIndex and how do I use it on OpenGL?

I am a noob in OpenGL ES 2.0 (for WebGL) and I'm trying to draw a simple model I've made with a 3D tool and exported to .fbx format. I've been able to draw some models that only have: A vertex buffer, ...
0
votes
3answers
1k views

How do I create menu with text in OpenGL?

How would I go about creating a menu system with fonts in OpenGL? I want to make a dungeon crawler and will need a menu for inventory and stats for the weapons. I can draw a world made out of blocks ...
5
votes
4answers
3k views

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

Hey, hello guys, 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 ...
3
votes
1answer
2k views

How to create a perspective field of view matrix?

Hey, hello. I am learning a little of WebGL (OpenGL ES 2.0) through the http://learningwebgl.com tutorials, but it uses a third party library to create the View, Projection and transformation matrices ...
7
votes
2answers
1k views

Missing features from WebGL and OpenGL ES

I've started using WebGL and am pleased with how easy it is to leverage my OpenGL (and by extension OpenGL ES) experience. However, my understanding is as follows: OpenGL ES is a subset of OpenGL ...
4
votes
1answer
2k views

Rendering 2d sprites into a 3d world?

In opengl how do I render 2d sprites in opengl given that I have a png of the sprite? See images as an example of the effect I'd like to achieve. Also I would like to overlay weapons on the screen ...