void fxRenderImage::findCameraAxis(TSRenderContext &rc)
{
TMat3F wCamMat = rc.getCamera()->getTCW();
camAxis = transform.p;
camAxis -= wCamMat.p;
camDist = m_dot(camAxis,camAxis);
if (IsEqual(camDist,0.0f))
camAxis.set(0,1,0); // camAxis.len()==0, just use standard axes
else
{
camDist = m_sqrtf(camDist);
camAxis *= 1/camDist;
}
}
/** return square root of a */
template <> inline float CMath<float>::sqrt(float a) { return m_sqrtf(a); }
// decide where to place and then add to the manager
void SimExplosionCloud::lightFuse(SimExplosion * explosion, Point3F & cameraPos, bool igniteNow)
{
// decide when to detonate
if (!igniteNow)
explosion->setDetonationTime(g_expRand.getFloat(0,detonationMax));
Point3F pos;
Point3F vec(0, 0, 0);
Point3F worldPos,worldVec;
switch (form)
{
case Sphere :
{
// try to make sure explosions no closer together than 1m in z
int maxZ = (int) radius;
if (maxZ)
{
if (topOnly)
vec.z = g_expRand.getInt(0,maxZ);
else
vec.z = g_expRand.getInt(-maxZ,maxZ);
}
// don't break, fall through to circle
}
case Circle :
{
float angle = g_expRand.getFloat(0,float(M_2PI));
float circleRad = m_sqrtf(radius*radius - vec.z *vec.z);
vec.x = circleRad * m_cos(angle);
vec.y = circleRad * m_sin(angle);
pos = center;
pos += vec;
break;
}
case Screen:
{
if (radius>0.1f) // if radius==0, skip some work
{
vec=cameraPos;
vec -= center;
vec.normalize();
Point3F dirX,dirZ;
if (fabs(vec.z) < 0.95)
{
// vec is not near vector (0,0,1), so we can
// use it as the pivot vector
m_cross(vec, Point3F(0,0,1), &dirX);
dirX.normalize();
m_cross(dirX, vec, &dirZ);
}
else
{
// dirY is near vector (0,0,1), so use
// pivot Point3F(1,0,0) instead
m_cross(Point3F(1,0,0), vec, &dirZ);
dirZ.normalize();
m_cross(vec, dirZ, &dirX);
}
dirX *= g_expRand.getFloat(-radius,radius);
dirZ *= g_expRand.getFloat(-radius,radius);
vec *= radius;
vec += dirX;
vec += dirZ;
}
pos = center;
pos += vec;
break;
}
case Box :
{
int side;
if (topOnly)
side = g_expRand.getInt(1,5);
else
side = g_expRand.getInt(0,5);
pos = box.fMax;
switch (side)
{
case 0:
pos.z = box.fMin.z;
case 1:
pos.x = g_expRand.getFloat(box.fMin.x,box.fMax.x);
pos.y = g_expRand.getFloat(box.fMin.y,box.fMax.y);
break;
case 2:
pos.y = box.fMin.y;
case 3:
pos.x = g_expRand.getFloat(box.fMin.x,box.fMax.x);
pos.z = g_expRand.getFloat(box.fMin.z,box.fMax.z);
break;
case 4:
pos.x = box.fMin.x;
case 5:
pos.y = g_expRand.getFloat(box.fMin.y,box.fMax.y);
pos.z = g_expRand.getFloat(box.fMin.z,box.fMax.z);
break;
}
switch (side)
{
case 0:
vec.set(0,0,box.fMin.z-box.fMax.z);
break;
case 1:
vec.set(0,0,box.fMax.z-box.fMin.z);
break;
case 2:
vec.set(0,box.fMin.y-box.fMax.y,0);
break;
case 3:
vec.set(0,box.fMax.y-box.fMin.y,0);
break;
case 4:
vec.set(box.fMin.x-box.fMax.x,0,0);
break;
case 5:
vec.set(box.fMax.x-box.fMin.x,0,0);
break;
}
break;
}
}
// now put into world coords
if (hasTransform)
{
m_mul(pos,transform,&worldPos);
m_mul(vec,(RMat3F&)transform,&worldVec);
}
else
{
worldPos=pos;
worldVec=vec;
}
Point3F camAxis = worldPos;
camAxis -= cameraPos;
if (m_dot(camAxis,worldVec)>0.0f)
{
worldPos -= worldVec;
worldPos -= worldVec;
}
explosion->setPosition(worldPos);
explosion->setAxis(worldVec); // move away from the building... ;->
explosion->setSound(false);
manager->addObject(explosion);
}
