Revision: 48563
http://projects.blender.org/scm/viewvc.php?view=rev&root=bf-blender&revision=48563
Author: genscher
Date: 2012-07-03 21:49:01 +0000 (Tue, 03 Jul 2012)
Log Message:
-----------
Smoke Vorticity/turbulence: Porting the code idea from new turbulence paper.
Moving obstacles will generate turbulence/vorticity now. This allows for a very
natural reaction of smoke to obstacles.
Part of my Blender Smoke Development Phase III.
Modified Paths:
--------------
branches/smoke2/intern/smoke/intern/FLUID_3D.cpp
Modified: branches/smoke2/intern/smoke/intern/FLUID_3D.cpp
===================================================================
--- branches/smoke2/intern/smoke/intern/FLUID_3D.cpp 2012-07-03 21:03:39 UTC
(rev 48562)
+++ branches/smoke2/intern/smoke/intern/FLUID_3D.cpp 2012-07-03 21:49:01 UTC
(rev 48563)
@@ -1092,7 +1092,7 @@
if(_obstacles[index-_slabSize]) { pB =
pC; vObst[2] = _zVelocityOb[index - _slabSize]; vMask[2] = 0; }
_xVelocity[index] -= 0.5f * (pR - pL) *
invDx;
- _yVelocity[index] -= 0.5f * (pU - pD)
* invDx;
+ _yVelocity[index] -= 0.5f * (pU - pD) *
invDx;
_zVelocity[index] -= 0.5f * (pT - pB) *
invDx;
_xVelocity[index] = (vMask[0] *
_xVelocity[index]) + vObst[0];
@@ -1374,6 +1374,9 @@
//////////////////////////////////////////////////////////////////////
// add vorticity to the force field
//////////////////////////////////////////////////////////////////////
+#define VORT_VEL(i, j) \
+ ((_obstacles[obpos[(i)]] & 8) ? ((abs(objvelocity[(j)][obpos[(i)]]) >
FLT_EPSILON) ? objvelocity[(j)][obpos[(i)]] : velocity[(j)][index]) :
velocity[(j)][obpos[(i)]])
+
void FLUID_3D::addVorticity(int zBegin, int zEnd)
{
//int x,y,z,index;
@@ -1409,9 +1412,18 @@
float gridSize = 0.5f / _dx;
//index = _slabSize + _xRes + 1;
+ float *velocity[3];
+ float *objvelocity[3];
+ velocity[0] = _xVelocity;
+ velocity[1] = _yVelocity;
+ velocity[2] = _zVelocity;
+
+ objvelocity[0] = _xVelocityOb;
+ objvelocity[1] = _yVelocityOb;
+ objvelocity[2] = _zVelocityOb;
+
size_t vIndex=_xRes + 1;
-
for (int z = zBegin + bb1; z < (zEnd - bt1); z++)
{
size_t index = index_ +(z-1)*_slabSize;
@@ -1421,25 +1433,47 @@
{
for (int x = 1; x < _xRes - 1; x++, index++)
{
+ if (!_obstacles[index])
+ {
+ int obpos[6];
- int up = _obstacles[index + _xRes] ? index :
index + _xRes;
- int down = _obstacles[index - _xRes] ? index :
index - _xRes;
- float dy = (up == index || down == index) ?
1.0f / _dx : gridSize;
- int out = _obstacles[index + _slabSize] ?
index : index + _slabSize;
- int in = _obstacles[index - _slabSize] ?
index : index - _slabSize;
- float dz = (out == index || in == index) ?
1.0f / _dx : gridSize;
- int right = _obstacles[index + 1] ? index :
index + 1;
- int left = _obstacles[index - 1] ? index :
index - 1;
- float dx = (right == index || left == index) ?
1.0f / _dx : gridSize;
+ obpos[0] = (_obstacles[index + _xRes]
== 1) ? index : index + _xRes; // up
+ obpos[1] = (_obstacles[index - _xRes]
== 1) ? index : index - _xRes; // down
+ float dy = (obpos[0] == index ||
obpos[1] == index) ? 1.0f / _dx : gridSize;
- _xVorticity[vIndex] = (_zVelocity[up] -
_zVelocity[down]) * dy + (-_yVelocity[out] + _yVelocity[in]) * dz;
- _yVorticity[vIndex] = (_xVelocity[out] -
_xVelocity[in]) * dz + (-_zVelocity[right] + _zVelocity[left]) * dx;
- _zVorticity[vIndex] = (_yVelocity[right] -
_yVelocity[left]) * dx + (-_xVelocity[up] + _xVelocity[down])* dy;
+ obpos[2] = (_obstacles[index +
_slabSize] == 1) ? index : index + _slabSize; // out
+ obpos[3] = (_obstacles[index -
_slabSize] == 1) ? index : index - _slabSize; // in
+ float dz = (obpos[2] == index ||
obpos[3] == index) ? 1.0f / _dx : gridSize;
- _vorticity[vIndex] = sqrtf(_xVorticity[vIndex]
* _xVorticity[vIndex] +
+ obpos[4] = (_obstacles[index + 1] == 1)
? index : index + 1; // right
+ obpos[5] = (_obstacles[index - 1] == 1)
? index : index - 1; // left
+ float dx = (obpos[4] == index ||
obpos[5] == index) ? 1.0f / _dx : gridSize;
+
+ float xV[2], yV[2], zV[2];
+
+ zV[1] = VORT_VEL(0, 2);
+ zV[0] = VORT_VEL(1, 2);
+ yV[1] = VORT_VEL(2, 1);
+ yV[0] = VORT_VEL(3, 1);
+ _xVorticity[vIndex] = (zV[1] - zV[0]) *
dy + (-yV[1] + yV[0]) * dz;
+
+ xV[1] = VORT_VEL(2, 0);
+ xV[0] = VORT_VEL(3, 0);
+ zV[1] = VORT_VEL(4, 2);
+ zV[0] = VORT_VEL(5, 2);
+ _yVorticity[vIndex] = (xV[1] - xV[0]) *
dz + (-zV[1] + zV[0]) * dx;
+
+ yV[1] = VORT_VEL(4, 1);
+ yV[0] = VORT_VEL(5, 1);
+ xV[1] = VORT_VEL(0, 0);
+ xV[0] = VORT_VEL(1, 0);
+ _zVorticity[vIndex] = (yV[1] - yV[0]) *
dx + (-xV[1] + xV[0])* dy;
+
+ _vorticity[vIndex] =
sqrtf(_xVorticity[vIndex] * _xVorticity[vIndex] +
_yVorticity[vIndex] *
_yVorticity[vIndex] +
_zVorticity[vIndex] *
_zVorticity[vIndex]);
+ }
vIndex++;
}
vIndex+=2;
@@ -1449,7 +1483,7 @@
// calculate normalized vorticity vectors
float eps = _vorticityEps;
-
+
//index = _slabSize + _xRes + 1;
vIndex=_slabSize + _xRes + 1;
@@ -1468,21 +1502,24 @@
{
float N[3];
- int up = _obstacles[index + _xRes] ?
vIndex : vIndex + _xRes;
- int down = _obstacles[index - _xRes] ?
vIndex : vIndex - _xRes;
+ int up = (_obstacles[index + _xRes]
== 1) ? vIndex : vIndex + _xRes;
+ int down = (_obstacles[index - _xRes]
== 1) ? vIndex : vIndex - _xRes;
float dy = (up == vIndex || down ==
vIndex) ? 1.0f / _dx : gridSize;
- int out = _obstacles[index +
_slabSize] ? vIndex : vIndex + _slabSize;
- int in = _obstacles[index -
_slabSize] ? vIndex : vIndex - _slabSize;
+
+ int out = (_obstacles[index +
_slabSize] == 1) ? vIndex : vIndex + _slabSize;
+ int in = (_obstacles[index -
_slabSize] == 1) ? vIndex : vIndex - _slabSize;
float dz = (out == vIndex || in ==
vIndex) ? 1.0f / _dx : gridSize;
- int right = _obstacles[index + 1] ?
vIndex : vIndex + 1;
- int left = _obstacles[index - 1] ?
vIndex : vIndex - 1;
+
+ int right = (_obstacles[index + 1] ==
1) ? vIndex : vIndex + 1;
+ int left = (_obstacles[index - 1] ==
1) ? vIndex : vIndex - 1;
float dx = (right == vIndex || left ==
vIndex) ? 1.0f / _dx : gridSize;
+
N[0] = (_vorticity[right] -
_vorticity[left]) * dx;
N[1] = (_vorticity[up] -
_vorticity[down]) * dy;
N[2] = (_vorticity[out] -
_vorticity[in]) * dz;
float magnitude = sqrtf(N[0] * N[0] +
N[1] * N[1] + N[2] * N[2]);
- if (magnitude > 0.0f)
+ if (magnitude > FLT_EPSILON)
{
magnitude = 1.0f / magnitude;
N[0] *= magnitude;
@@ -1490,24 +1527,24 @@
N[2] *= magnitude;
_xForce[index] += (N[1] *
_zVorticity[vIndex] - N[2] * _yVorticity[vIndex]) * _dx * eps;
- _yForce[index] -= (N[0] *
_zVorticity[vIndex] - N[2] * _xVorticity[vIndex]) * _dx * eps;
+ _yForce[index] += (N[2] *
_xVorticity[vIndex] - N[0] * _zVorticity[vIndex]) * _dx * eps;
_zForce[index] += (N[0] *
_yVorticity[vIndex] - N[1] * _xVorticity[vIndex]) * _dx * eps;
}
- } // if
- vIndex++;
- } // x loop
- vIndex+=2;
- } // y loop
- //vIndex+=2*_xRes;
- } // z loop
-
+ } // if
+ vIndex++;
+ } // x loop
+ vIndex+=2;
+ } // y loop
+ //vIndex+=2*_xRes;
+ } // z loop
+
if (_xVorticity) delete[] _xVorticity;
if (_yVorticity) delete[] _yVorticity;
if (_zVorticity) delete[] _zVorticity;
if (_vorticity) delete[] _vorticity;
}
+#undef CURL_VEL
-
void FLUID_3D::advectMacCormackBegin(int zBegin, int zEnd)
{
Vec3Int res = Vec3Int(_xRes,_yRes,_zRes);
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