ggambett

1,563 reputation

310

bio	website	gabrielgambetta.com
	location
	age	32
visits	member for	2 years, 5 months
	seen	May 5 at 12:49
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Software Engineer at Google Zürich.

Former Founder, Director and CTO of Mystery Studio, a small independent game developer.

	1,563 reputation	bio	website	gabrielgambetta.com	visits	member for	2 years, 5 months
310 badges		location			seen	May 5 at 12:49

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May 6	awarded	Nice Answer
Mar 12	awarded	Nice Answer
Dec 19	awarded	Yearling
Dec 13	comment	How do I create a curved line or filled circle or generally a circle using C++/SDL? I approve this message. Start with something you understand (like what Ken suggests for circles, or y = Ax+B for straight line segments), and then learn the "real" algorithms (e.g. Bresenham)
Oct 21	comment	Vector transform equation explanation Exactly. In general, x(a,b) + y(c,d) == (xa + yc, xb + yd). With multiplications and additions you never mix the different components of the vectors.
Oct 21	answered	Vector transform equation explanation
Oct 4	comment	Depth interpolation for z-buffer, with scanline Glad to hear that. I did, in fact, teach Computer Graphics in a previous life :)
Oct 4	comment	Depth interpolation for z-buffer, with scanline And finally, why. A plane (where the triangle is embedded) is Ax + By + Cz + D = 0. z is clearly linear function of (x, y). You project so x'=x/z and y'=y/z. From there, x=x'z and y=y'z. If you replace these in the original equation you get Ax'z + By'x + Cz + D = 0. Now z = -D / (Ax' + By' + C), where it's clear that z is not a linear function of (x', y'). But 1/z is therefore (Ax' + By' + C) / -D, which is a linear function of (x', y').
Oct 4	comment	Depth interpolation for z-buffer, with scanline Oh, and regarding "when": compute the 1/Z values before starting to rasterize the triangle (e.g. just before the vertical loop), so you get interpolated 1/Z at the left and right of the scanline. Interpolate these linearly (do NOT do 1/Z again - the interpolated values are already 1/Z!), and undo the transform just before checking the zbuffer.
Oct 4	answered	Depth interpolation for z-buffer, with scanline
Sep 4	awarded	Nice Answer
Feb 7	awarded	Nice Answer
Jan 16	answered	Where can I find information for programming a game to avoid network latency issues?
Jan 15	answered	Client side prediction + sync
Dec 19	awarded	Yearling
May 7	comment	Curved movement between two points +1 for Bezier curves. For the use described, it's probably the easiest and the most controllable.
Apr 26	answered	Library to load images into textures, Linux, C and OpenGl
Mar 28	awarded	Good Answer
Mar 13	comment	Is flash game development not considered 'proper' game development? @AttackingHobo Now I'll actually answer your question :) Alchemy was my first choice, it didn't work, so I wrote the C++ to AS3 converter.
Mar 13	comment	Is flash game development not considered 'proper' game development? @AttackingHobo Yes, that was my first idea. It worked with small tests, but the compiler choked and died with a real project. Besides, I was getting all kinds of weird runtime errors seemingly for no reason at all (see forums.adobe.com/thread/590648 for example) so it wasn't a viable option in the end.