Comments on: Questionable Content

By: Ivan-Assen

Ivan-Assen — Mon, 10 May 2010 08:15:16 +0000

We spent our first 5 years in the industry doing 2D RTS games, so it was only natural, when starting our 3D engine, to keep “the action” in the XY plane, and make +Z “up”

By: Reg

Reg — Sun, 09 May 2010 18:29:08 +0000

I know it’s too late but here are my answers anyway:

* A (RGB) of course.
* Usually A (+Y) as it’s assumed by default in DirectX/OpenGL, although I sometimes use +Z when doing outdoor terrain rendering.
* ?? My English is not so good, sorry.
* A because I use DirectX. And I believe it’s generally more intuitive to transform vec2 = vec1 * matrix than vec2 = matrix * vec1

By: itsjrich

itsjrich — Sat, 08 May 2010 15:56:18 +0000

1) Definitely RGB.
2) +Y… Z is for depth, hence Z-buffering.
3) Green-yellow… had no idea that there were other colors with that name.
4) Right column.

By: Real-Time Rendering · Questionable Answers

Real-Time Rendering · Questionable Answers — Sat, 08 May 2010 14:03:14 +0000

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By: islet8

islet8 — Sat, 08 May 2010 07:38:25 +0000

A (although i’m a game developer)
B
A
B

By: LRBni

LRBni — Sat, 08 May 2010 00:05:06 +0000

1. A (RYB) – unless talking specifically about CG
2. A (+Y)
3. ? – Never heard that word to describe a colour
4. B (right column)

By: xskinyx

xskinyx — Fri, 07 May 2010 23:09:24 +0000

A,A,A,A

Question 2 could go either way though…. since alot of artwork is authored Z up. I prefer LHS, so Y up seems more sane.

By: mvandewettering

mvandewettering — Fri, 07 May 2010 20:01:07 +0000

1. RGB. I can’t think of a reason to consider RYB.
2. I think of +Y as going up. It’s annoying though, since I think of pixel coordinates having +Y going down.
3. Isn’t chartreuse a wine made in France?
4. I’ve written it both ways. In recent years, I prefer to think of points as column vectors, which means it is most natural to place them in the last column. I believe that I’ve written raytracers with both conventions though.

By: cyril crassin

cyril crassin — Fri, 07 May 2010 19:17:26 +0000

There is a green and a yellow Chartreuse, but no way it can be orange ! It is made a few kilometers away from Grenoble

By: Simon Taylor

Simon Taylor — Fri, 07 May 2010 17:07:52 +0000

For no. 4, obviously I’d put them in the bottom row, and when that didn’t work I’d try the right column .