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better deformation logic #10

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37 changes: 26 additions & 11 deletions game/objfunc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -37,10 +37,10 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include "../math/vector.h"
#include "../physics/bond.h"
#include "../physics/particle.h"

void objectcycle(void)
{
int count,count2,count3,count4;
int count,count2,count3;
float deformation;
int x,y;
float vec[3],vec2[3];
float veclength/*,bondlength*/;
Expand Down Expand Up @@ -117,7 +117,7 @@ void objectcycle(void)
for (count2=0;count2<object[count].numofparticles;count2++)
addvectors(object[count].velocity,object[count].velocity,particle[object[count].particle[count2]].velocity);
scalevector(object[count].velocity,object[count].velocity,1.0f/(float)object[count].numofparticles);

zerovector(object[count].position);
for (count2=0;count2<object[count].numofparticles;count2++)
addvectors(object[count].position,object[count].position,particle[object[count].particle[count2]].position);
Expand Down Expand Up @@ -402,23 +402,38 @@ void objectcycle(void)
}
}

count4=0;
deformation=0;
/* Hooke's law: the force on a spring F = k * X where X is the
distance it's being stretched or compressed, and k is an arbitrary
constant depending on what Gish is made out of.

integrate force over distance to get energy (aka damage)

so damage = k * X * X / 2
*/
// these constants determined by science
#define NORMALVECLENGTH object[count].radius
#define SEVERITY 0.36
#define THRESHOLD 8
for (count2=0;count2<16;count2++)
for (count3=0;count3<16;count3++)
if (abs(count2-count3)>6)
{
subtractvectors(vec,particle[object[count].particle[count3]].position,particle[object[count].particle[count2]].position);
veclength=vectorlength(vec);
if (veclength<0.15f)
count4++;
deformation += (veclength-NORMALVECLENGTH) *
(veclength-NORMALVECLENGTH) *
SEVERITY / 2;
//if (veclength<0.15f)
// object[count].hitpoints-=(0.2f-veclength)*500.0f;
}

/* Gish death by deformation (TODO: rename count4 etc.) */
if (count4>=2)
object[count].hitpoints-=(count4-1)*50;

/* Gish death by deformation */
if(deformation > THRESHOLD)
object[count].hitpoints-=(deformation-1);
#undef THRESHOLD
#undef MINLENGTH
#undef SEVERITY
if (object[count].numoforientations==0)
copyvector(object[count].orientation[1],yaxis);
else
Expand Down Expand Up @@ -686,7 +701,7 @@ void objectcycle(void)
subtractvectors(vec,particle[object[count].particle[count2]].position,object[count].position);
crossproduct(vec2,zaxis,vec);
normalizevector(vec2,vec2);

scaleaddvectors(particle[object[count].particle[count2]].velocity,particle[object[count].particle[count2]].velocity,vec2,spin*0.003f);
}
}
Expand Down