reflecting a laser from wall

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reflecting a laser from wall #408291 09/28/12 18:47 09/28/12 18:47
Joined: Dec 2008 Posts: 1,218 Germany Rackscha OP Serious User
Rackscha OP Serious User Joined: Dec 2008 Posts: 1,218 Germany	Hi, seems i havent understood something correctly. Ok, imagine we have a laser for a weapon i want to reflect from walls. first, i calculate start/endvec for my laser. do the trace if i hit something: i substract start from endvec(to get the direction, saved in BVec) vec_to_angle for hit.nx and rotate my BVec by the angle, add hit.x and trace again from hit.x to BVec. Okay but the reflection seems to be wrong(as a laser hiting a surface isnt reflected straight back) mh, maybe someone has an idea? Greetings Rackscha MY Website with news of my projects: (for example my current Muliplayer Bomberman, GenesisPrecompiler for LiteC and TileMaster, an easy to use Tile editor) Sparetime-Development

Re: reflecting a laser from wall [Re: Rackscha] #408292 09/28/12 19:00 09/28/12 19:00
Joined: Oct 2011 Posts: 1,082 Germany C Ch40zzC0d3r Serious User
Ch40zzC0d3r Serious User C Joined: Oct 2011 Posts: 1,082 Germany	you could use bounce variable of 3DGS, there are better ways, but its a start^^

Re: reflecting a laser from wall [Re: Ch40zzC0d3r] #408293 09/28/12 19:15 09/28/12 19:15
Joined: Dec 2008 Posts: 1,218 Germany Rackscha OP Serious User
Rackscha OP Serious User Joined: Dec 2008 Posts: 1,218 Germany	bounce is not used on c_trace MY Website with news of my projects: (for example my current Muliplayer Bomberman, GenesisPrecompiler for LiteC and TileMaster, an easy to use Tile editor) Sparetime-Development

Re: reflecting a laser from wall [Re: Rackscha] #408295 09/28/12 20:28 09/28/12 20:28
Joined: Oct 2005 Posts: 4,771 Bay City, MI lostclimate Expert
lostclimate Expert Joined: Oct 2005 Posts: 4,771 Bay City, MI	add to the reflect vector an inverse of the difference between the normal and the initial vector?

Re: reflecting a laser from wall [Re: lostclimate] #408297 09/28/12 21:31 09/28/12 21:31
Joined: Dec 2008 Posts: 1,218 Germany Rackscha OP Serious User
Rackscha OP Serious User Joined: Dec 2008 Posts: 1,218 Germany	is the normalvector normalized between -1 to 1 if its normalized, a difference is not directly possible, right? MY Website with news of my projects: (for example my current Muliplayer Bomberman, GenesisPrecompiler for LiteC and TileMaster, an easy to use Tile editor) Sparetime-Development

Re: reflecting a laser from wall [Re: Rackscha] #408300 09/28/12 22:36 09/28/12 22:36
Joined: Sep 2003 Posts: 6,861 Kiel (Germany) Superku Senior Expert
Superku Senior Expert Joined: Sep 2003 Posts: 6,861 Kiel (Germany)	trace -> if hit, scale normal vector with -2*vec_dot(dir,normal), add normal vector to dir (and add dir to your target vector for the new trace target location). You can search wikipedia ("reflection") for details on this formula. "Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual Check out my new game: Pogostuck: Rage With Your Friends

Re: reflecting a laser from wall [Re: Superku] #408304 09/28/12 23:49 09/28/12 23:49
Joined: Dec 2008 Posts: 1,218 Germany Rackscha OP Serious User
Rackscha OP Serious User Joined: Dec 2008 Posts: 1,218 Germany	thanks superku. But i noticed that bounce is set in c_trace, too. Now it seems to work. Code: vec_to_angle(LAng, bounce); vec_set(BVec, vector(200, 0, 0)); vec_rotate(BVec, LAng); vec_add(BVec, hit.x); MY Website with news of my projects: (for example my current Muliplayer Bomberman, GenesisPrecompiler for LiteC and TileMaster, an easy to use Tile editor) Sparetime-Development