UT_Matrix3 RainData::computeRotationMatrix(UT_Vector3 rainDirection)
{
static const UT_Vector3 up(0.0, -1.0, 0.0);
UT_Matrix3 rotDirMatrix(1.0);
rainDirection.normalize();
UT_Vector3 axis = cross (up, rainDirection);
axis.normalize();
fpreal angle = acos (dot (up, rainDirection));
rotDirMatrix.rotate (axis, -angle); // minus for proper generation
// of the noise in
// RainData::computeInitialPositions
return rotDirMatrix;
}
OP_ERROR
SOP_Smoke_Source::cookMySop(OP_Context &context)
{
// We must lock our inputs before we try to access their geometry.
// OP_AutoLockInputs will automatically unlock our inputs when we return.
// NOTE: Don't call unlockInputs yourself when using this!
OP_AutoLockInputs inputs(this);
if (inputs.lock(context) >= UT_ERROR_ABORT)
return error();
fpreal now = context.getTime();
duplicateSource(0, context);
// These three lines enable the local variable support. This allows
// $CR to get the red colour, for example, as well as supporting
// any varmap created by the Attribute Create SOP.
// Note that if you override evalVariableValue for your own
// local variables (like SOP_Star does) it is essential you
// still call the SOP_Node::evalVariableValue or you'll not
// get any of the benefit of the built in local variables.
// The variable order controls precedence for which attribute will be
// be bound first if the same named variable shows up in multiple
// places. This ordering ensures point attributes get precedence.
setVariableOrder(3, 2, 0, 1);
// The setCur* functions track which part of the gdp is currently
// being processed - it is what is used in the evalVariableValue
// callback as the current point. The 0 is for the first input,
// you can have two inputs so $CR2 would get the second input's
// value.
setCurGdh(0, myGdpHandle);
// Builds the lookup table matching attributes to the local variables.
setupLocalVars();
// Here we determine which groups we have to work on. We only
// handle point groups.
if (error() < UT_ERROR_ABORT && cookInputGroups(context) < UT_ERROR_ABORT &&
(!myGroup || !myGroup->isEmpty()))
{
UT_AutoInterrupt progress("Flattening Points");
// Handle all position, normal, and vector attributes.
// It's not entirely clear what to do for quaternion or transform attributes.
// We bump the data IDs of the attributes to modify in advance,
// since we're already looping over them, and we want to avoid
// bumping them all for each point, in case that's slow.
UT_Array<GA_RWHandleV3> positionattribs(1);
UT_Array<GA_RWHandleV3> normalattribs;
UT_Array<GA_RWHandleV3> vectorattribs;
GA_Attribute *attrib;
GA_FOR_ALL_POINT_ATTRIBUTES(gdp, attrib)
{
// Skip non-transforming attributes
if (!attrib->needsTransform())
continue;
GA_TypeInfo typeinfo = attrib->getTypeInfo();
if (typeinfo == GA_TYPE_POINT || typeinfo == GA_TYPE_HPOINT)
{
GA_RWHandleV3 handle(attrib);
if (handle.isValid())
{
positionattribs.append(handle);
attrib->bumpDataId();
}
}
else if (typeinfo == GA_TYPE_NORMAL)
{
GA_RWHandleV3 handle(attrib);
if (handle.isValid())
{
normalattribs.append(handle);
attrib->bumpDataId();
}
}
else if (typeinfo == GA_TYPE_VECTOR)
{
GA_RWHandleV3 handle(attrib);
if (handle.isValid())
{
vectorattribs.append(handle);
attrib->bumpDataId();
}
}
}
// Iterate over points up to GA_PAGE_SIZE at a time using blockAdvance.
GA_Offset start;
GA_Offset end;
for (GA_Iterator it(gdp->getPointRange(myGroup)); it.blockAdvance(start, end);)
{
// Check if user requested abort
if (progress.wasInterrupted())
break;
for (GA_Offset ptoff = start; ptoff < end; ++ptoff)
{
// This sets the current point that is beint processed to
// ptoff. This means that ptoff will be used for any
// local variable for any parameter evaluation that occurs
// after this point.
// NOTE: Local variables and repeated parameter evaluation
// is significantly slower and sometimes more complicated
// than having a string parameter that specifies the name
// of an attribute whose values should be used instead.
// That parameter would only need to be evaluated once,
// the attribute could be looked up once, and quickly
// accessed; however, a separate point attribute would
// be needed for each property that varies per point.
// Local variable evaluation isn't threadsafe either,
// whereas attributes can be read safely from multiple
// threads.
//
// Long story short: *Local variables are terrible.*
myCurPtOff[0] = ptoff;
float dist = DIST(now);
UT_Vector3 normal;
if (!DIRPOP())
{
switch (ORIENT())
{
case 0 : // XY Plane
normal.assign(0, 0, 1);
break;
case 1 : // YZ Plane
normal.assign(1, 0, 0);
break;
case 2 : // XZ Plane
normal.assign(0, 1, 0);
break;
}
}
else
{
normal.assign(NX(now), NY(now), NZ(now));
normal.normalize();
}
// Project positions onto the plane by subtracting
// off the normal component.
for (exint i = 0; i < positionattribs.size(); ++i)
{
UT_Vector3 p = positionattribs(i).get(ptoff);
p -= normal * (dot(normal, p) - dist);
positionattribs(i).set(ptoff, p);
}
// Normals will now all either be normal or -normal.
for (exint i = 0; i < normalattribs.size(); ++i)
{
UT_Vector3 n = normalattribs(i).get(ptoff);
if (dot(normal, n) < 0)
n = -normal;
else
n = normal;
normalattribs(i).set(ptoff, n);
}
// Project vectors onto the plane through the origin by
// subtracting off the normal component.
for (exint i = 0; i < vectorattribs.size(); ++i)
{
UT_Vector3 v = vectorattribs(i).get(ptoff);
v -= normal * dot(normal, v);
vectorattribs(i).set(ptoff, v);
}
}
}
}
void GR_rmanPtc::renderWire( GU_Detail *gdp,
RE_Render &ren,
const GR_AttribOffset &ptinfo,
const GR_DisplayOption *dopt,
float lod,
const GU_PrimGroupClosure *hidden_geometry
)
{
int i, nprim;
GEO_Primitive *prim;
UT_Vector3 v3;
rmanPtcSop::rmanPtcDetail *detail = dynamic_cast<rmanPtcSop::rmanPtcDetail*>(gdp);
if ( !detail )
return;
// rebuild our display list
if ( detail->redraw )
{
srand(0);
GEO_PointList &points = detail->points();
int display_channel = detail->display_channel;
// render as points
GEO_Point *pt = 0;
UT_Vector4 pos;
float col[3] = {1.0,1.0,1.0};
if ( !detail->use_disk )
{
ren.pushPointSize(detail->point_size);
ren.beginPoint();
}
for ( unsigned int i=0; i<points.entries(); ++i )
{
if ( rand()/(float)RAND_MAX<=detail->display_probability )
{
// point position
pt = points[i];
pos = pt->getPos();
// display colour
float *ptr = NULL;
if (detail->attributes.size() >0) {
ptr = pt->castAttribData<float>(
detail->attributes[display_channel] );
if (ptr) {
if ( detail->attribute_size[display_channel]==1)
col[0] = col[1] = col[2] = ptr[0];
else
{
col[0] = ptr[0];
col[1] = ptr[1];
col[2] = ptr[2];
}
}
}
// draw point
if ( !detail->use_cull_bbox ||
detail->cull_bbox.isInside( pos ) )
{
if ( !detail->use_disk )
{
// render as points
ren.setColor( col[0], col[1], col[2], 1 );
ren.vertex3DW( pos.x(), pos.y(), pos.z() );
}
else
{
// render as disks
UT_Vector3 n = *pt->castAttribData<UT_Vector3>(detail->N_attrib);
float r = *pt->castAttribData<float>(detail->R_attrib);
n.normalize();
UT_Vector3 ref(1,0,0);
UT_Vector3 up = ref;
up.cross(n);
up.normalize();
UT_Vector3 right = up;
right.cross(n);
right.normalize();
UT_DMatrix4 mat(
right.x(), right.y(), right.z(), 0,
up.x(), up.y(), up.z(), 0,
n.x(), n.y(), n.z(), 0,
pos.x(), pos.y(), pos.z(), 1 );
ren.pushMatrix();
ren.multiplyMatrix(mat);
ren.pushColor( UT_Color( UT_RGB, col[0], col[1], col[2] ) );
ren.circlefW( 0, 0, detail->point_size * r, 8 );
ren.popColor();
ren.popMatrix();
}
}
}
}
if ( !detail->use_disk )
{
ren.endPoint();
}
}
}