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tetprim/SOP_Tetra.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 Tetra SOP
*/
#include "SOP_Tetra.h"
#include "GEO_PrimTetra.h"
#include <GU/GU_Detail.h>
#include <OP/OP_Operator.h>
#include <UT/UT_Vector3.h>
#include <SYS/SYS_Types.h>
#include <limits.h>
#include <stddef.h>
using namespace HDK_Sample;
//
// Help is stored in a "wiki" style text file. The text file should be copied
// to $HOUDINI_PATH/help/nodes/sop/tetra.txt
//
// See the sample_install.sh file for an example.
//
///
/// newSopOperator is the hook that Houdini grabs from this dll
/// and invokes to register the SOP. In this case we add ourselves
/// to the specified operator table.
///
void
{
"hdk_tetra", // Internal name
"Tetra", // UI name
SOP_Tetra::myConstructor, // How to build the SOP
SOP_Tetra::myTemplateList, // My parameters
0, // Min # of sources
0, // Max # of sources
0, // Local variables
OP_FLAG_GENERATOR)); // Flag it as generator
}
};
{
return new SOP_Tetra(net, name, op);
}
: SOP_Node(net, name, op)
{
// 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_Tetra::~SOP_Tetra() {}
{
fpreal now = context.getTime();
// Since we don't have inputs, we don't need to lock them.
float rad = RADIUS(now);
UT_Vector3 translate(CENTERX(now), CENTERY(now), CENTERZ(now));
// Try to reuse the existing tetrahedron, if the detail
// hasn't been cleared.
GEO_PrimTetra *tet = NULL;
if (gdp->getNumPrimitives() == 1)
{
// This type check is not strictly necessary, since
// this SOP only ever makes a GEO_PrimTetra, but it's
// here just in case, and as an example.
tet = (GEO_PrimTetra *)prim;
}
if (tet == NULL)
{
// In addition to destroying everything except the empty P
// and topology attributes, this bumps the data IDs for
// those remaining attributes, as well as the primitive list
// data ID.
// Build a tetrahedron
tet = GEO_PrimTetra::build(gdp, true);
}
for (int i = 0; i < 4; i++)
{
UT_Vector3 pos(i == 1, i == 2, i == 3);
pos *= rad;
pos += translate;
GA_Offset ptoff = tet->getPointOffset(i);
gdp->setPos3(ptoff, pos);
}
// We've modified P, so we need to bump the data ID,
// (though in the case where we did clearAndDestroy(), it's
// redundant, because that already bumped it).
// Set the node selection for this primitive. This will highlight all
// the tets generated by the node, but only if the highlight flag for this
// node is on and the node is selected.
return error();
}