physics in water

code:

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VAR earthgravity[3] = 0,0, -386;

ACTION physik_ball
	{
	ph_setgravity( earthgravity );

	phent_settype(my, PH_RIGID, PH_SPHERE);
	phent_setmass(my, 50, PH_SPHERE);
	phent_setfriction(my, 90);	phent_setelasticity(my, 90, 10);
	phent_setdamping(my, 30, 20 );
	}

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code:

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...the warlock is a great dancer!

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Damned! I told him not to drink more than 6 glases of whisky! (ACTION: patrol_path() with a simple event_function()).

code:

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 Example 1
 
VAR earthgravity[3];
earthgravity[0] = 0;
earthgravity[1] = 0;
earthgravity[2] = 386;
 
VAR watergravity[3];
watergravity[0] = 0;
watergravity[1] = 0;
watergravity[2] = 6;
 
WHILE(1)
	{
	IF (IN_PASSABLE == 1)
		{
		ph_setgravity( watergravity );
		}
	ELSE
		{
		ph_setgravity( earthgravity );
		}
	wait (1);
	}
 
 Example 2
 
VAR force_up_in_passable[3];
force_up_in_passable[0] = 0;
force_up_in_passable[1] = 0;
force_up_in_passable[2] = 50;
 	
WHILE(1)
	{
	IF (IN_PASSABLE == 1)
		{
		phent_addforceglobal(my,force_up_in_passable,nullvector);
		}
	wait (1);
	}

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quote:

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You have to simulate the H2O molecules. fill the pool with millions of tiny invisible balls!

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YES! YES! YES! Damned, why I didn't tried before, hehehe!!!

quote:

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Originally posted by DocJoe:
I let fall the following ball on/in a passable block (water). I really get stange behaviour (the ball becomes like a shark, hehehe!) . What do you think about? Is there a way of improvement?

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code:

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var earthgravity[3] = 0,0, -386;
function emit_sphere(); //prototype of the function


sound whamm = <explo.wav>;
sound dump=<dump.wav>;

function shoot_event 
{
  if (EVENT_TYPE == EVENT_shoot) 
  {
    ENT_playSOUND(MY,whamm,1000);
    vec_set(temp,normal);
    vec_scale(temp,40000);
	 phent_addcentralforce ( my, temp );
  }
  
    if (EVENT_TYPE == EVENT_friction) 
  {
    ENT_playSOUND(MY,dump,1000);
	
  }
  
   if (EVENT_TYPE == EVENT_Block) 
  {
    
    if(vec_length(bounce)>100)
    {	
    	my.skill41=snd_playing(my.skill40);
    	if(my.skill41==0)
    	{my.skill40=ENT_playSOUND(MY,dump,200);}
    }
	
  }
// etc. ...
} 


function phset() //Normalbahaviour
{
phent_setmass(my, 0.5, PH_Sphere); 
phent_setfriction(my, 70);
phent_setelasticity(my, 70,20);
phent_setdamping(my, 20, 20 );
	
}


function wphset()//Waterbehaviour
{
phent_setmass(my, 0.001, PH_Sphere); 
phent_setfriction(my, 70);
phent_setelasticity(my, 70,20);
phent_setdamping(my, 95, 95 );
	
}



action sphere

{

var speedvec[3];//for waterbehaviour
var onwater=0;
my.metal=on;
my.shadow=on;
my.enable_block=on;
my.ENABLE_shoot = ON; 
my.EVENT = shoot_event;



ph_setgravity( earthgravity );
phent_settype(my, PH_RIGID, PH_SPHERE);
phent_setmaxspeed(my,30000, 5000);

phset();
wait(5);

vec_set(speedvec,nullvector);
speedvec.z=1;

temp.x=cos(camera.pan)*cos(camera.tilt)*30000; 
temp.y=sin(camera.pan)*cos(camera.tilt)*30000; 
temp.z=sin(camera.tilt)*30000;

phent_addforcelocal(my,temp,nullvector);


while(1)
{

 if(content(my.x)==2) // Entity on passable Block?
    {
      if(onwater==0)
      {
      	wphset();  //set Physic-Params for Waterbehaviour
      	onwater=1;
      }
      phent_addcentralforce(my,speedvec);
    }
    else
    {
     	if(onwater)
    	{
    	   onwater=0;
    	   phset();  //No longer in Water->reset params
    	} 
    }
  wait(1);
}


}

string mdl_sphere=<sphere3.mdl>;

function emit_sphere()
{
temp.x=camera.x+cos(camera.pan)*cos(camera.tilt)*100;
temp.y=camera.y+sin(camera.pan)*cos(camera.tilt)*100;
temp.z=camera.z+sin(camera.tilt)*100;
temp.z=camera.z+sin(camera.tilt)*100;
ent_create(mdl_sphere,temp,sphere);
}

on_mouse_left=emit_sphere;

 

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quote:

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Originally posted by Marco Grubert:
As for the patch: does reducing the mass help in fixing the problem? I would have thought increasing the mass should be more suitable in that it makes the sphere more resistant to movement (as does increasing the damping).

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quote:

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Many of the physics effects shown there can be reproduced with A6 (buoyancy and "soft bodies" not yet).

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How about recreating a GameStudio demo with that gravity weapon ?

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Originally posted by ventilator:
i guess this mattress effect could be done with the new bonerotate commands and some invisible cubes connected with hinges.

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If I had the demo (in order to break it) I could probably tell you how they have done that
My guess is that they are using a simple cloth (mass-spring) system extended to 3 dimensions (as opposed to 2 for the regular cloth grid)- then just move the corner vertices, contract the springs, and interpolate the intermediate vertices. Similar to what you were suggesting with bones and invisible cubes.

quote:

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i tried it right after seeing the halflife2 video but it was trickier than i thought. it would be easier if all physics entities (not only constraints) had motors. or do you think i should just turn off physics for the object while holding it with the grav-gun?

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I would estimate the target position of the object using the current view vector scaled by the object's initial distance. Then take the difference between that target and the object's current location, scale this by the object's mass and framerate and use this scaled difference as parameter for addcentralforce. So basically you just add linear force correction whenever the object is not where it's supposed to be. It seemed like the Valve guys used a number of rods connected via (motorized) ball joints, similar to what you did with the crane. But that might be overkill. Of course that's all just physics- the important part is finding the right flare bitmaps

quote:

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Originally posted by Devilery:
Marco, as you know maybe, I'm working together with Doc_Joe.So I know that the warlock must become invisible.Thats not a bug.

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It was hard to tell- how about fading him out instead or do some spell casting if hit?

quote:

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Then take the difference between that target and the object's current location, scale this by the object's mass and framerate and use this scaled difference as parameter for addcentralforce.

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quote:

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Originally posted by Marco Grubert:
I guess the next big challenge will be to create a jointed humanoid, arachnoid, etc.

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UUUHUH!! Rag-doll physics! Can't wait to push that warlock over a cliff
Can't wait till i get the new beta, so i can have many physics objects...

~Phantom88~