2D Platformer, Advanced physics SAT. (Think Sonic)

EduardoMoura · 2013-01-03T03:07:13

Well, first of all I have done this in different ways but right now I am trying to implement it with SAT. Before I start let me set two points clear: Separating Axis Algorithm is working flawless, both Swept method (TOI etc)and Discrete(Normal MTV) (I have written a article on it, with a tutorial , soon to be posted for all to use/read) I can implement this in a hacky way with a crap ton of sensors around the player., by this I mean around 8. So my question is, if I wanted to implement a movement like in the sonic Hedgehogs games for genesis using SAT how you go about it? I have done this before with using sensors around the player to calculate slopes and all the other collisions, I could do it like this again, but I feel this way is hacky, I mean, using SAT I get somewhat a simplified 3D collision system, meaning I have access to normal of the polygons, their vertices, MTV, estimated time of impact, estimated time the polygon will leave (think bullets), etc. I though of using the normal of the polygon the character is standing but it doesn't seem to want to work decently. I guess I want to find a aproach without using a sensor for each direction, bot, top, left,right angle, main. So even if you don't know how to handle slopes like sonic does, SAT collision how would you do it in a simple movement way without using sensors, but still getting enough info to know where the collision is and stuff like that (This might trigger some ideas on my side, sinse I already know how to do this, your way might make see another perspective anyway). Any insights would be greatly appreciated... Sincerely Morphex.

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Started by EduardoMoura January 03, 2013 12:25 AM

9 comments, last by EduardoMoura 11 years, 4 months ago

EduardoMoura

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January 03, 2013 03:07 AM

Hum, so should I go with sensors then? with sensor I can do any loops, any slopes whatever, I just feel that for a "general" aproach using SAT its a bit hacky. I am thinking in checking the slope angle with the terrain normal, but I am not sure how to go about it.

For the physics part its just moving the player in Xspeed * Cos and in the Y its Sin or something like that, so it ould follow the terrain slope.

I guess I am bit "noob" in using Sat to do platformers, since I can seem to find a way to physics without sensors.

Check out my new blog: Morphexe

2D Platformer, Advanced physics SAT. (Think Sonic)

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2D Platformer, Advanced physics SAT. (Think Sonic)

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