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SOP/SOP_PointWave.C
/*
* Copyright (c) 2018
* Side Effects Software Inc. All rights reserved.
*
* Redistribution and use of Houdini Development Kit samples in source and
* binary forms, with or without modification, are permitted provided that the
* following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. The name of Side Effects Software may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY SIDE EFFECTS SOFTWARE `AS IS' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL SIDE EFFECTS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*----------------------------------------------------------------------------
* The PointWave SOP. This SOP PointWaves the geometry onto a plane.
*/
#include "SOP_PointWave.h"
#include <GU/GU_Detail.h>
#include <OP/OP_Operator.h>
#include <UT/UT_Matrix3.h>
#include <UT/UT_Matrix4.h>
#include <SYS/SYS_Math.h>
#include <stddef.h>
using namespace HDK_Sample;
void
{
"hdk_pointwave",
"Point Wave",
1,
1,
0));
}
static PRM_Name names[] = {
PRM_Name("amp", "Amplitude"),
PRM_Name("phase", "Phase"),
PRM_Name("period", "Period"),
};
};
{
return new SOP_PointWave(net, name, op);
}
: SOP_Node(net, name, op), myGroup(NULL)
{
// This indicates that this SOP manually manages its data IDs,
// so that Houdini can identify what attributes may have changed,
// e.g. to reduce work for the viewport, or other SOPs that
// check whether data IDs have changed.
// By default, (i.e. if this line weren't here), all data IDs
// would be bumped after the SOP cook, to indicate that
// everything might have changed.
// If some data IDs don't get bumped properly, the viewport
// may not update, or SOPs that check data IDs
// may not cook correctly, so be *very* careful!
mySopFlags.setManagesDataIDs(true);
}
SOP_PointWave::~SOP_PointWave() {}
{
// The SOP_Node::cookInputPointGroups() provides a good default
// implementation for just handling a point selection.
context, // This is needed for cooking the group parameter, and cooking the input if alone.
myGroup, // The group (or NULL) is written to myGroup if not alone.
alone, // This is true iff called outside of cookMySop to update handles.
// true means the group will be for the input geometry.
// false means the group will be for gdp (the working/output geometry).
true, // (default) true means to set the selection to the group if not alone and the highlight flag is on.
0, // (default) Parameter index of the group field
-1, // (default) Parameter index of the group type field (-1 since there isn't one)
true, // (default) true means that a pointer to an existing group is okay; false means group is always new.
false, // (default) false means new groups should be unordered; true means new groups should be ordered.
true, // (default) true means that all new groups should be detached, so not owned by the detail;
// false means that new point and primitive groups on gdp will be owned by gdp.
0 // (default) Index of the input whose geometry the group will be made for if alone.
);
}
{
// 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();
// Duplicate our incoming geometry with the hint that we only
// altered points. Thus, if our input was unchanged, we can
// easily roll back our changes by copying point values.
duplicatePointSource(0, context);
fpreal t = context.getTime();
// We evaluate our parameters outside the loop for speed. If we
// wanted local variable support, we'd have to do more setup
// (see SOP_Flatten) and also move these inside the loop.
float phase = PHASE(t);
float amp = AMP(t);
float period = PERIOD(t);
return error();
// Here we determine which groups we have to work on. We only
// handle point groups.
return error();
GA_Offset ptoff;
GA_FOR_ALL_GROUP_PTOFF(gdp, myGroup, ptoff)
{
UT_Vector3 p = gdp->getPos3(ptoff);
p.y() += SYSsin( (p.x() / period + phase) * M_PI * 2 ) * amp;
gdp->setPos3(ptoff, p);
}
// If we've modified P, and we're managing our own data IDs,
// we must bump the data ID for P.
if (!myGroup || !myGroup->isEmpty())
return error();
}