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Results tagged with opengl
Search options not deleted user 1091
OpenGL is a graphics standard and API which targets the desktop and workstation markets. It is designed to be easy to accelerate with dedicated computer hardware, and hence most implementations give greatly improved performance over traditional software rendering. Currently, OpenGL is used for applications like CAD software and computer games. It is also cross-platform. The OpenGL standard is controlled by the Khronos group, which also controls OpenGL ES.
1 vote
OpenGL wireframe
You could try some kind of simple distance function in the pixel shader. Perhaps something like barycentric coordinates (store different RGB at the vertices and the rasteriser will do most of the work …
- 2,959
6 votes
Accepted
GL_EXT_draw_instanced vs VBO's
The advantage to instancing is to allow multiple objects to be drawn in a single draw-call, reducing the overhead of calling the API. Typically as well as the geometry, you would also have a buffer c …
- 2,959
0 votes
Camera rotation (OpenGL)
Are you actually setting the identity matrix at any point? What other matrix ops are happening, and in what order?
- 2,959
6 votes
Accepted
Is there an efficient, available online, algorithm for converting a matrix of squares into a...
Firstly, I'd suggest that if your primitives (the squares) have different appearances, especially opacity, then tri-stripping may not make sense (i.e. the vertices aren't really shared). Secondly, th …
- 2,959
2 votes
What is the purpose of the canonical view volume?
I note an answer has already been accepted, but it's generally useful for clipping to have the view frustum transformed into a unit cube.
- 2,959
8 votes
How to get PS3/Xbox 360 experience without having access to Dev kits?
If it's a graphics related position you're looking for, demonstrate you know 3D maths, and how to use an API well (OpenGL or D3D, don't care which really - just make sure you optimise it well). …
- 2,959
2 votes
Accepted
Draw multiple LINE_LOOPs in one glDrawElements call
Surely if you're using indices, you're not repeating verts? You could also look at instancing, where you have a set of primitives being repeatedly drawn with a set of matrices being sent at lower fre …
- 2,959
2 votes
Accepted
Correct order of rotation and translation
You're right about having the camera applied first and then the object transform, because this allows the usage of pushing and popping matrix states between objects. Aside from that there is no "corr …
- 2,959
1 vote
3D theory before graphics APIs?
If you want to understand how a traditional software rendering pipeline works (and things haven't changed that much even with the introduction of programmable hardware pipelines), one book I'd definit …
- 2,959
2 votes
Accepted
Atmospheric Scattering
HDR isn't always necessary. A lot of the time you can get away with compressing your output values in the pixel shader. Essentially you're just doing the tone-mapping in a single pass, so you have HDR …
- 2,959
5 votes
Accepted
Motion blur is blurring static stuff
The texel co-ordinates, if you have bilinear filtering, are falling between the texels rather than being centered. You either need to to add half a texel to the UVs, or turn off filtering.
- 2,959
6 votes
Accepted
Efficient skeletal animation
Limiting the number of bone influences is common, yes. You can either 0-weight unused influences, or have a loop/early-out mechanism to skip. As for whether it works for an RTS, I don't have a refere …
- 2,959