On 08/05/2015 at 11:31, xxxxxxxx wrote:
User Information:
Cinema 4D Version: 15
Platform: Windows ; Mac ;
Language(s) : C++ ;
---------
It seems the gradient calculate function requires InitRender to be called first.
Is there a way to evaluate CalcGradientPixel without a render structure or is there a way to initialize the render structure without volume data?
Ama
On 08/05/2015 at 11:43, xxxxxxxx wrote:
Here is what I tried:
colorGradient = (Gradient* )data->GetCustomDataType( GRADIENTID, CUSTOMDATATYPE_GRADIENT );
InitRenderStruct renderStruct;
renderStruct.Init( bn->GetDocument() );
VolumeData *volumeData = VolumeData::Alloc();
renderStruct.vd = volumeData;
colorGradient->InitRender( renderStruct );
I am confused why this not working.
then try to calculate.
Ama
On 09/05/2015 at 02:53, xxxxxxxx wrote:
You don't need no VolumeData for the GradientData. Maybe that is the problem, it works for me with an
empty InitRenderStruct.
On 09/05/2015 at 05:52, xxxxxxxx wrote:
Nope. Here's how it works in Python:
import c4d
def main() :
gradient = op[c4d.ID_USERDATA,1]
irs = c4d.modules.render.InitRenderStruct()
res = gradient.InitRender(irs)
if res != c4d.INITRENDERRESULT_OK:
print "InitRender() failed"
try:
for i in xrange(10) :
x = i / 9.0
print gradient.CalcGradientPixel(x)
finally:
gradient.FreeRender()
main()
And I remember successfully doing it in C++ without calling InitRenderStruct::Init().
On 10/05/2015 at 07:25, xxxxxxxx wrote:
I am trying to get this working within an xpresso node. If I access the gradient directly from the res file it all works fine. If I access it through a port, it initializes, has the correct render knot count, but crashes on Calc or FreeRender.
Ama
On 11/05/2015 at 10:05, xxxxxxxx wrote:
Hello,
can you tell us what exactly you mean with "working within an xpresso node"? Are you creating your own GvOperatorData plugin?
Best wishes,
Sebastian
On 11/05/2015 at 10:27, xxxxxxxx wrote:
I have created a GvOperatorData plugin. The problem is that I can not use a port for the gradient successfully. If I use the res static gradient is all fine. If I use the port gradient, it will init but crashes when calc or free is called.
Ama
On 12/05/2015 at 10:00, xxxxxxxx wrote:
Hello,
in an Xpresso node, you don't handle parameters but ports. These ports must be handled in special ways:
static Int32 input_ids[] = { GV_TEST_A, GV_TEST_B, 0 };
...
GvValuesInfo ports; // data structure for all ports
// init the input ports
virtual Bool InitCalculation(GvNode *bn, GvCalc *calc, GvRun *run)
{
return GvBuildValuesTable(bn, ports, calc, run, input_ids);;
}
virtual Bool Calculate(GvNode *bn, GvPort *port, GvRun *r, GvCalc *calc)
{
// calculate all ports
if (!GvCalculateInValuesTable(bn, r, calc, ports)) return false;
// get the "Gradient" port
GvPort* portGradient = ports.in_values[0]->GetPort();
// get the "Gradient" data
Gradient* gradient = nullptr;
portGradient->GetDataInstance((const void*&)gradient, CUSTOMDATATYPE_GRADIENT, r);
// sample the gradient
if(gradient != nullptr)
{
InitRenderStruct irs(bn->GetDocument());
gradient->InitRender(irs);
for(Int32 i = 0; i < 10; i++)
{
Vector color = gradient->CalcGradientPixel(Float(i) / 10.0);
GePrint(String::VectorToString(color));
}
gradient->FreeRender();
}
return true;
}
// free data
virtual void FreeCalculation(GvNode *bn, GvCalc *calc)
{
GvFreeValuesTable(bn, ports);
}
best wishes,
Sebastian