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Dispersion fix, Skylark

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This commit is contained in:
Simon
2010-10-03 16:19:03 +01:00
parent 5591a7346c
commit 67d263d108
1 changed files with 14 additions and 14 deletions
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28
src/powder.c
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@@ -144,6 +144,11 @@ int try_move(int i, int x, int y, int nx, int ny)
#define REFRACT 0x80000000 #define REFRACT 0x80000000
/* heavy flint glass, for awesome refraction/dispersion
this way you can make roof prisms easily */
#define GLASS_IOR 1.9
#define GLASS_DISP 0.07
static unsigned direction_to_map(float dx, float dy) static unsigned direction_to_map(float dx, float dy)
{ {
return (dx >= 0) | return (dx >= 0) |
@@ -207,13 +212,6 @@ static int find_next_boundary(int pt, int *x, int *y, int dm, int *em)
return 0; return 0;
} }
static int vec_colinear(float nx, float ny, float vx, float vy)
{
float d = 1.0f/hypot(vx, vy);
d *= nx*vx + ny*vy;
return (d >= 0.99) || (d <= -0.99);
}
int get_normal(int pt, int x, int y, float dx, float dy, float *nx, float *ny) int get_normal(int pt, int x, int y, float dx, float dy, float *nx, float *ny)
{ {
int ldm, rdm, lm, rm; int ldm, rdm, lm, rm;
@@ -257,9 +255,6 @@ int get_normal(int pt, int x, int y, float dx, float dy, float *nx, float *ny)
*nx = ey * r; *nx = ey * r;
*ny = -ex * r; *ny = -ex * r;
if(vec_colinear(*ny, -*nx, dx, dy))
return 0;
return 1; return 1;
} }
@@ -505,7 +500,7 @@ inline int create_part(int p, int x, int y, int t)
static void create_cherenkov_photon(int pp) static void create_cherenkov_photon(int pp)
{ {
int i, lr, nx, ny; int i, lr, nx, ny;
float r; float r, eff_ior;
if(pfree == -1) if(pfree == -1)
return; return;
@@ -528,7 +523,7 @@ static void create_cherenkov_photon(int pp)
parts[i].life = 680; parts[i].life = 680;
parts[i].x = parts[pp].x; parts[i].x = parts[pp].x;
parts[i].y = parts[pp].y; parts[i].y = parts[pp].y;
parts[i].temp = parts[pp].temp; parts[i].temp = parts[pmap[ny][nx] >> 8].temp;
parts[i].tmp = 0; parts[i].tmp = 0;
if(lr) { if(lr) {
@@ -540,7 +535,7 @@ static void create_cherenkov_photon(int pp)
} }
/* photons have speed of light. no discussion. */ /* photons have speed of light. no discussion. */
r = 1.44f / hypotf(parts[i].vx, parts[i].vy); r = 1.269 / hypotf(parts[i].vx, parts[i].vy);
parts[i].vx *= r; parts[i].vx *= r;
parts[i].vy *= r; parts[i].vy *= r;
} }
@@ -2528,7 +2523,8 @@ killed:
kill_part(i); kill_part(i);
continue; continue;
} }
nn = 2.3f - 0.02f*r; nn = GLASS_IOR - GLASS_DISP*(r-15)/15.0f;
nn *= nn;
nrx = -nrx; nrx = -nrx;
nry = -nry; nry = -nry;
@@ -2539,6 +2535,10 @@ killed:
if(ct2 < 0.0f) { if(ct2 < 0.0f) {
parts[i].vx -= 2.0f*ct1*nrx; parts[i].vx -= 2.0f*ct1*nrx;
parts[i].vy -= 2.0f*ct1*nry; parts[i].vy -= 2.0f*ct1*nry;
parts[i].x = lx;
parts[i].y = ly;
nx = (int)(lx + 0.5f);
ny = (int)(ly + 0.5f);
} else { } else {
ct2 = sqrtf(ct2); ct2 = sqrtf(ct2);
ct2 = ct2 - nn*ct1; ct2 = ct2 - nn*ct1;