dreta

2,248 reputation

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GitHub: https://github.com/dreta

	2,248 reputation	bio	website		visits	member for	1 year, 4 months
420 badges		location	Poland		seen	2 days ago

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Apr 5	awarded	Popular Question
Apr 2	accepted	RK4 integration and Continuous Collision Detection
Mar 31	comment	Camera not strafing (GLSL) @TM3P I was talking to sarahm, his comment is incorrect, i have no idea why it has 2 upvotes. It applies to your situation because that's how your matrices are constructed, but it's not a rule. It's alright if you don't understand this at all, but he should if he's commenting on it. BTW, if you'd like to learn linear algebra in a very accessible manner, try Game Engine Architecture by Jason Gregory, the information is presented in a VERY accessible manner and it's by a game developer for game developers.
Mar 30	comment	Camera not strafing (GLSL) @sarahm No it doesn't, GLSL will use what ever multiplication is appropriate for the notation. If you'll write vector * matrix, then the vector will be treated as a row vector, if you'll write matrix * vector then the vector will be treated as a column vector. I do all my 3D calculations using row vectors, because it's more natural to write it like that for me. It's up to you to set up your matrices for row or column multiplication, OpenGL doesn't care.
Mar 30	answered	Camera not strafing (GLSL)
Mar 29	revised	Techniques for incorporating physics engines like Box2D into a Component-based Entity System added 83 characters in body; edited tags
Mar 29	asked	Techniques for incorporating physics engines like Box2D into a Component-based Entity System
Mar 11	comment	Friction due to gravity in an impulse based physics engine @SteveH yeah dude, if you added a reference i'd be very happy to accept that as the answer
Feb 21	comment	Resolving a collision with forces Your model for resting contacts is odd. Resting contacts aren't just for gravity, they should work for any force. The easiest way that works is to just remove the velocity gained due to acceleration in the previous frame upon contact. Also for small velocities you can remove restitution completely, though your calculations don't account for restitution. This approach works for all forces, it's easy to implement and looks good enough.
Feb 20	revised	Why doesn't glBindVertexArray work in this case? deleted 112 characters in body
Feb 20	revised	Why doesn't glBindVertexArray work in this case? added 19 characters in body
Feb 20	answered	Why doesn't glBindVertexArray work in this case?
Feb 3	comment	Resolving a collision with forces @TravisG Oh, alright i see the issue.
Feb 3	comment	Resolving a collision with forces Personally, i'd suggest picking up a book on physics engines, at least read the first few chapters on Newtonian physics. Your assumptions are incorrect and trying to reply to this question would mean having to teach you basics of physics while trying to explain high level algorithms for solving collisions.
Feb 3	comment	Resolving a collision with forces Force does not equal acceleration, first of all. You need mass to calculate acceleration. If you're modifying positions to stop the two bodies from penetrating, you should use mass as well and move both bodies based on it. Applying a force equal to the penetration vector has no merit. Box2D is impulse based, it works on velocities directly, it may not be "correct", but it's good enough. Dealing with velocity changes in an impulse based engine is very simple, so could you specify if you definitively want a force based solution, or is the much simpler impulse based solution good enough.
Jan 28	comment	8-bit Game: To pre-scale images, or post scale my Cocos2d scene. Which is the better approach? @smokris That's a good point, the answer would probably benefit if you included that in it.
Jan 27	comment	How a “view” is handled in an Entity-Component based model? @Yannbane No, sorry.
Jan 27	comment	How a “view” is handled in an Entity-Component based model? This question probably can't be answered in a reasonable manner, TBH. There's no point in comparing MVC and CBES, they're trying to achieve different goals using different means. Just read the T=Machine articles with a clear mind and forget about your background.
Jan 27	comment	How do I calculate how an object will move from one point to another? @jimmis98 If you subtract vector A from vector B, you get a new vector that's "going" from tip of A to the tip of B. It works for points just as well, because points and vectors are represented in the same way, where the tail is always the origin and the tip is represented by a point. It's indeed the best way to tackle the issue, the angle approach is unnecessarily convoluted and much more expensive. If you want to represent this with an equation, then if A + C = B, then B - A = C. Where A and B are your points/vectors and C is a vector "going" from A to B.
Jan 26	comment	Slow Firefox Javascript Canvas Performance? What's your performance on IE 9? Firefox has been notoriously slow for me too, while Chrome and IE are doing just fine.