forked from bartvdbraak/blender
Fix for stroke rendering instability with stroke geometry shaders.
* Stroke::Resample(int nPoints) was not properly working when a wrong value was returned from Stroke::getLength2D(), resulting in repeated warning messages "Warning: incorrect points number" during stroke rendering. The main cause was that stroke geometry shaders did not update the two-dimensional (2D) length (also referred to as curvilinear abscissa) after they modified the 2D points of stroke vertices. Now all stroke geometry shaders make explicit calls for Stroke::UpdateLength() that has been introduced for recomputing the 2D length. Many thanks to Josef who reported the problem together with sample .blend files for reproducing the issue. * Missing Python wrapper of Stroke::getLength2D() was added.
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@ -449,6 +449,7 @@ class SinusDisplacementShader(StrokeShader):
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u = v.u()
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n = n * self._amplitude * math.cos(distance / self._wavelength * 2 * math.pi + self._phase)
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v.setPoint(p + n)
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stroke.UpdateLength()
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class PerlinNoise1DShader(StrokeShader):
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def __init__(self, freq = 10, amp = 10, oct = 4, angle = 45, seed = -1):
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@ -468,6 +469,7 @@ class PerlinNoise1DShader(StrokeShader):
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nres = self.__noise.turbulence1(v.u(), self.__freq, self.__amp, self.__oct)
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v.setPoint(v.getPoint() + nres * self.__dir)
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it.increment()
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stroke.UpdateLength()
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class PerlinNoise2DShader(StrokeShader):
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def __init__(self, freq = 10, amp = 10, oct = 4, angle = 45, seed = -1):
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@ -488,6 +490,7 @@ class PerlinNoise2DShader(StrokeShader):
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nres = self.__noise.turbulence2(vec, self.__freq, self.__amp, self.__oct)
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v.setPoint(v.getPoint() + nres * self.__dir)
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it.increment()
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stroke.UpdateLength()
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# Predicates and helper functions
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@ -223,6 +223,29 @@ static PyObject * Stroke_RemoveVertex( BPy_Stroke *self, PyObject *args ) {
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Py_RETURN_NONE;
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}
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static char Stroke_UpdateLength___doc__[] =
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".. method:: UpdateLength()\n"
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"\n"
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" Updates the 2D length of the Stroke.\n";
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static PyObject * Stroke_UpdateLength( BPy_Stroke *self ) {
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self->s->UpdateLength();
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Py_RETURN_NONE;
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}
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static char Stroke_getLength2D___doc__[] =
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".. method:: getLength2D()\n"
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"\n"
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" Returns the 2D length of the Stroke.\n"
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"\n"
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" :return: the 2D length of the Stroke.\n"
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" :rtype: float\n";
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static PyObject * Stroke_getLength2D( BPy_Stroke *self ) {
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return PyFloat_FromDouble( self->s->getLength2D() );
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}
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static char Stroke_getMediumType___doc__[] =
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".. method:: getMediumType()\n"
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"\n"
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@ -415,6 +438,8 @@ static PyMethodDef BPy_Stroke_methods[] = {
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{"Resample", ( PyCFunction ) Stroke_Resample, METH_VARARGS, Stroke_Resample___doc__},
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{"RemoveVertex", ( PyCFunction ) Stroke_RemoveVertex, METH_VARARGS, Stroke_RemoveVertex___doc__},
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{"InsertVertex", ( PyCFunction ) Stroke_InsertVertex, METH_VARARGS, Stroke_InsertVertex___doc__},
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{"UpdateLength", ( PyCFunction ) Stroke_UpdateLength, METH_NOARGS, Stroke_UpdateLength___doc__},
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{"getLength2D", ( PyCFunction ) Stroke_getLength2D, METH_NOARGS, Stroke_getLength2D___doc__},
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{"getMediumType", ( PyCFunction ) Stroke_getMediumType, METH_NOARGS, Stroke_getMediumType___doc__},
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{"getTextureId", ( PyCFunction ) Stroke_getTextureId, METH_NOARGS, Stroke_getTextureId___doc__},
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{"hasTips", ( PyCFunction ) Stroke_hasTips, METH_NOARGS, Stroke_hasTips___doc__},
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@ -586,6 +586,8 @@ namespace StrokeShaders {
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(v0)->setPoint(newFirst[0], newFirst[1]);
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Vec2d newLast(last+_amount*dn);
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(vn)->setPoint(newLast[0], newLast[1]);
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stroke.UpdateLength();
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return 0;
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}
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@ -611,6 +613,7 @@ namespace StrokeShaders {
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sv->setPoint(newPoint[0], newPoint[1]);
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++it;
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}
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stroke.UpdateLength();
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return 0;
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}
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@ -726,6 +729,7 @@ namespace StrokeShaders {
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++it;
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++n;
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}
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stroke.UpdateLength();
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return 0;
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}
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@ -844,6 +848,7 @@ namespace StrokeShaders {
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++p;
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++n;
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}
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stroke.UpdateLength();
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// Deal with extra vertices:
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if(nExtraVertex == 0)
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@ -931,6 +936,7 @@ namespace StrokeShaders {
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sv->setPoint(newPoint[0], newPoint[1]);
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++it;
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}
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stroke.UpdateLength();
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return 0;
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}
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@ -1038,6 +1044,7 @@ namespace StrokeShaders {
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// u.normalize();
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// (*a)->setPoint((*a)->x()-u.x()*10, (*a)->y()-u.y()*10);
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}
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stroke.UpdateLength();
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// delete stuff
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for(cp=_results.begin(), cpend=_results.end();
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@ -1076,6 +1083,7 @@ namespace StrokeShaders {
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{
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v->setPoint(piece.A.x()+v->u()*u.x()+n.x()*offset, piece.A.y()+v->u()*u.y()+n.y()*offset);
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}
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stroke.UpdateLength();
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return 0;
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}
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@ -674,28 +674,7 @@ void Stroke::RemoveVertex(StrokeVertex *iVertex)
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break;
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}
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}
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// recompute various values (length, curvilign abscissa)
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float curvabsc = 0.f;
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it=_Vertices.begin();
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itend=_Vertices.end();
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vertex_container::iterator previous=it;
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for(;
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(it!=itend);
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++it)
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{
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if(it != previous)
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curvabsc += ((*it)->point2d()-(*previous)->point2d()).norm();
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(*it)->setCurvilinearAbscissa(curvabsc);
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previous = it;
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}
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_Length = curvabsc;
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it=_Vertices.begin();
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for(;
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(it!=itend);
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++it)
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{
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(*it)->setStrokeLength(_Length);
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}
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UpdateLength();
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}
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void Stroke::InsertVertex(StrokeVertex *iVertex, StrokeInternal::StrokeVertexIterator next)
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@ -704,10 +683,14 @@ void Stroke::InsertVertex(StrokeVertex *iVertex, StrokeInternal::StrokeVertexIte
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vertex_container::iterator itnext = next.getIt();
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_Vertices.insert(itnext, iVertex);
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UpdateLength();
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}
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void Stroke::UpdateLength()
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{
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// recompute various values (length, curvilign abscissa)
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float curvabsc = 0.f;
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it=_Vertices.begin();
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itend=_Vertices.end();
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vertex_container::iterator it=_Vertices.begin(), itend=_Vertices.end();
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vertex_container::iterator previous=it;
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for(;
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(it!=itend);
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@ -466,6 +466,9 @@ public:
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*/
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void InsertVertex(StrokeVertex *iVertex, StrokeInternal::StrokeVertexIterator next);
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/*! Updates the 2D length of the Stroke */
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void UpdateLength();
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/* Render method */
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void Render(const StrokeRenderer *iRenderer );
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void RenderBasic(const StrokeRenderer *iRenderer );
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