bool KX_CameraActuator::Update(double curtime, bool frame)
{
/* wondering... is it really necessary/desirable to suppress negative */
/* events here? */
bool bNegativeEvent = IsNegativeEvent();
RemoveAllEvents();
if (bNegativeEvent || !m_ob)
return false;
KX_GameObject *obj = (KX_GameObject*) GetParent();
MT_Point3 from = obj->NodeGetWorldPosition();
MT_Matrix3x3 frommat = obj->NodeGetWorldOrientation();
/* These casts are _very_ dangerous!!! */
MT_Point3 lookat = ((KX_GameObject*)m_ob)->NodeGetWorldPosition();
MT_Matrix3x3 actormat = ((KX_GameObject*)m_ob)->NodeGetWorldOrientation();
float fp1[3]={0}, fp2[3]={0}, rc[3];
float inp, fac; //, factor = 0.0; /* some factor... */
float mindistsq, maxdistsq, distsq;
float mat[3][3];
/* The rules: */
/* CONSTRAINT 1: not implemented */
/* CONSTRAINT 2: can camera see actor? */
/* CONSTRAINT 3: fixed height relative to floor below actor. */
/* CONSTRAINT 4: camera rotates behind actor */
/* CONSTRAINT 5: minimum / maximum distance */
/* CONSTRAINT 6: again: fixed height relative to floor below actor */
/* CONSTRAINT 7: track to floor below actor */
/* CONSTRAINT 8: look a little bit left or right, depending on how the
*
* character is looking (horizontal x)
*/
/* ...and then set the camera position. Since we assume the parent of */
/* this actuator is always a camera, just set the parent position and */
/* rotation. We do not check whether we really have a camera as parent. */
/* It may be better to turn this into a general tracking actuator later */
/* on, since lots of plausible relations can be filled in here. */
/* ... set up some parameters ... */
/* missing here: the 'floorloc' of the actor's shadow */
mindistsq= m_minHeight*m_minHeight;
maxdistsq= m_maxHeight*m_maxHeight;
/* C1: not checked... is a future option */
/* C2: blender test_visibility function. Can this be a ray-test? */
/* C3: fixed height */
from[2] = (15.0f * from[2] + lookat[2] + m_height) / 16.0f;
/* C4: camera behind actor */
switch (m_axis) {
case OB_POSX:
/* X */
fp1[0] = actormat[0][0];
fp1[1] = actormat[1][0];
fp1[2] = actormat[2][0];
fp2[0] = frommat[0][0];
fp2[1] = frommat[1][0];
fp2[2] = frommat[2][0];
break;
case OB_POSY:
/* Y */
fp1[0] = actormat[0][1];
fp1[1] = actormat[1][1];
fp1[2] = actormat[2][1];
fp2[0] = frommat[0][1];
fp2[1] = frommat[1][1];
fp2[2] = frommat[2][1];
break;
case OB_NEGX:
/* -X */
fp1[0] = -actormat[0][0];
fp1[1] = -actormat[1][0];
fp1[2] = -actormat[2][0];
fp2[0] = frommat[0][0];
fp2[1] = frommat[1][0];
fp2[2] = frommat[2][0];
break;
case OB_NEGY:
/* -Y */
fp1[0] = -actormat[0][1];
fp1[1] = -actormat[1][1];
fp1[2] = -actormat[2][1];
fp2[0] = frommat[0][1];
fp2[1] = frommat[1][1];
fp2[2] = frommat[2][1];
break;
default:
assert(0);
break;
}
inp = fp1[0]*fp2[0] + fp1[1]*fp2[1] + fp1[2]*fp2[2];
fac = (-1.0f + inp) * m_damping;
from[0] += fac * fp1[0];
from[1] += fac * fp1[1];
from[2] += fac * fp1[2];
/* only for it lies: cross test and perpendicular bites up */
if (inp < 0.0f) {
/* Don't do anything if the cross product is too small.
* The camera up-axis becomes unstable and starts to oscillate.
* The 0.01f threshold is arbitrary but seems to work well in practice. */
float cross = fp1[0] * fp2[1] - fp1[1] * fp2[0];
if (cross > 0.01f) {
from[0] -= fac * fp1[1];
from[1] += fac * fp1[0];
}
else if (cross < -0.01f) {
from[0] += fac * fp1[1];
from[1] -= fac * fp1[0];
}
}
/* CONSTRAINT 5: minimum / maximum distance */
rc[0] = (lookat[0]-from[0]);
rc[1] = (lookat[1]-from[1]);
rc[2] = (lookat[2]-from[2]);
distsq = rc[0]*rc[0] + rc[1]*rc[1] + rc[2]*rc[2];
if (distsq > maxdistsq) {
distsq = 0.15f * (distsq - maxdistsq) / distsq;
from[0] += distsq*rc[0];
from[1] += distsq*rc[1];
from[2] += distsq*rc[2];
}
else if (distsq < mindistsq) {
distsq = 0.15f * (mindistsq - distsq) / mindistsq;
from[0] -= distsq*rc[0];
from[1] -= distsq*rc[1];
from[2] -= distsq*rc[2];
}
/* CONSTRAINT 7: track to floor below actor */
rc[0] = (lookat[0]-from[0]);
rc[1] = (lookat[1]-from[1]);
rc[2] = (lookat[2]-from[2]);
Kx_VecUpMat3(rc, mat, 3); /* y up Track -z */
/* now set the camera position and rotation */
obj->NodeSetLocalPosition(from);
actormat[0][0] = mat[0][0]; actormat[0][1] = mat[1][0]; actormat[0][2] = mat[2][0];
actormat[1][0] = mat[0][1]; actormat[1][1] = mat[1][1]; actormat[1][2] = mat[2][1];
actormat[2][0] = mat[0][2]; actormat[2][1] = mat[1][2]; actormat[2][2] = mat[2][2];
obj->NodeSetLocalOrientation(actormat);
return true;
}
bool KX_CameraActuator::Update(double curtime, bool frame)
{
/* wondering... is it really neccesary/desirable to suppress negative */
/* events here? */
bool bNegativeEvent = IsNegativeEvent();
RemoveAllEvents();
if (bNegativeEvent || !m_ob)
return false;
KX_GameObject *obj = (KX_GameObject*) GetParent();
MT_Point3 from = obj->NodeGetWorldPosition();
MT_Matrix3x3 frommat = obj->NodeGetWorldOrientation();
/* These casts are _very_ dangerous!!! */
MT_Point3 lookat = ((KX_GameObject*)m_ob)->NodeGetWorldPosition();
MT_Matrix3x3 actormat = ((KX_GameObject*)m_ob)->NodeGetWorldOrientation();
float fp1[3], fp2[3], rc[3];
float inp, fac; //, factor = 0.0; /* some factor... */
float mindistsq, maxdistsq, distsq;
float mat[3][3];
/* The rules: */
/* CONSTRAINT 1: not implemented */
/* CONSTRAINT 2: can camera see actor? */
/* CONSTRAINT 3: fixed height relative to floor below actor. */
/* CONSTRAINT 4: camera rotates behind actor */
/* CONSTRAINT 5: minimum / maximum distance */
/* CONSTRAINT 6: again: fixed height relative to floor below actor */
/* CONSTRAINT 7: track to floor below actor */
/* CONSTRAINT 8: look a little bit left or right, depending on how the
character is looking (horizontal x)
*/
/* ...and then set the camera position. Since we assume the parent of */
/* this actuator is always a camera, just set the parent position and */
/* rotation. We do not check whether we really have a camera as parent. */
/* It may be better to turn this into a general tracking actuator later */
/* on, since lots of plausible relations can be filled in here. */
/* ... set up some parameters ... */
/* missing here: the 'floorloc' of the actor's shadow */
mindistsq= m_minHeight*m_minHeight;
maxdistsq= m_maxHeight*m_maxHeight;
/* C1: not checked... is a future option */
/* C2: blender test_visibility function. Can this be a ray-test? */
/* C3: fixed height */
from[2] = (15.0*from[2] + lookat[2] + m_height)/16.0;
/* C4: camera behind actor */
if (m_x) {
fp1[0] = actormat[0][0];
fp1[1] = actormat[1][0];
fp1[2] = actormat[2][0];
fp2[0] = frommat[0][0];
fp2[1] = frommat[1][0];
fp2[2] = frommat[2][0];
}
else {
fp1[0] = actormat[0][1];
fp1[1] = actormat[1][1];
fp1[2] = actormat[2][1];
fp2[0] = frommat[0][1];
fp2[1] = frommat[1][1];
fp2[2] = frommat[2][1];
}
inp= fp1[0]*fp2[0] + fp1[1]*fp2[1] + fp1[2]*fp2[2];
fac= (-1.0 + inp) * m_damping;
from[0]+= fac*fp1[0];
from[1]+= fac*fp1[1];
from[2]+= fac*fp1[2];
/* alleen alstie ervoor ligt: cross testen en loodrechte bijtellen */
if(inp<0.0) {
if(fp1[0]*fp2[1] - fp1[1]*fp2[0] > 0.0) {
from[0]-= fac*fp1[1];
from[1]+= fac*fp1[0];
}
else {
from[0]+= fac*fp1[1];
from[1]-= fac*fp1[0];
}
}
/* CONSTRAINT 5: minimum / maximum afstand */
rc[0]= (lookat[0]-from[0]);
rc[1]= (lookat[1]-from[1]);
rc[2]= (lookat[2]-from[2]);
distsq= rc[0]*rc[0] + rc[1]*rc[1] + rc[2]*rc[2];
if(distsq > maxdistsq) {
distsq = 0.15*(distsq-maxdistsq)/distsq;
from[0] += distsq*rc[0];
from[1] += distsq*rc[1];
from[2] += distsq*rc[2];
}
else if(distsq < mindistsq) {
distsq = 0.15*(mindistsq-distsq)/mindistsq;
from[0] -= distsq*rc[0];
from[1] -= distsq*rc[1];
from[2] -= distsq*rc[2];
}
/* CONSTRAINT 7: track to schaduw */
rc[0]= (lookat[0]-from[0]);
rc[1]= (lookat[1]-from[1]);
rc[2]= (lookat[2]-from[2]);
Kx_VecUpMat3(rc, mat, 3); /* y up Track -z */
/* now set the camera position and rotation */
obj->NodeSetLocalPosition(from);
actormat[0][0]= mat[0][0]; actormat[0][1]= mat[1][0]; actormat[0][2]= mat[2][0];
actormat[1][0]= mat[0][1]; actormat[1][1]= mat[1][1]; actormat[1][2]= mat[2][1];
actormat[2][0]= mat[0][2]; actormat[2][1]= mat[1][2]; actormat[2][2]= mat[2][2];
obj->NodeSetLocalOrientation(actormat);
return true;
}
