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SOP/SOP_NURBS.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 NURBS SOP
*/
#include "SOP_NURBS.h"
#include <GU/GU_Detail.h>
#include <OP/OP_Operator.h>
#include <SYS/SYS_Math.h>
#include <limits.h>
#include <stddef.h>
using namespace HDK_Sample;
///
/// 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_nurbs", // Internal name
"NURBS", // UI name
SOP_NURBS::myConstructor, // How to build the SOP
SOP_NURBS::myTemplateList, // My parameters
0, // Min # of sources
0, // Max # of sources
0, // Local variables
OP_FLAG_GENERATOR)); // Flag it as generator
}
PRM_Template(PRM_INT, // Integer parameter.
PRM_Template::PRM_EXPORT_TBX, // Export to top of viewer
PRM_Template::PRM_EXPORT_TBX, // Export to top of viewer
NULL, &PRMorderRange),
};
{
return new SOP_NURBS(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_NURBS::~SOP_NURBS() {}
{
fpreal now = context.getTime();
int nu = SYSmax(COLS(now), 2); // Number of columns
int nv = SYSmax(ROWS(now), 2); // Number of rows
int uorder = SYSmin(UORDER(now), nu);
int vorder = SYSmin(VORDER(now), nv);
if (gdp->getNumPrimitives() == 1)
{
// NOTE: This SOP only ever generates a GEO_PrimNURBSurf,
// so we don't strictly *need* to check that it is
// one if the detail wasn't cleared, but it's best
// to check, just in case.
if (prim->getTypeId() == GA_PRIMNURBSURF)
{
if (surf->getNumRows() != nv || surf->getNumCols() != nu)
{
// Just delete and start over if wrong rows/cols.
surf = NULL;
}
if (surf && surf->getUOrder() != uorder)
{
// Just
GA_NUBBasis *basis = new GA_NUBBasis(0, 1, nu+uorder, uorder, true);
if (surf->setUBasis(basis) != 0)
{
delete basis;
surf = NULL;
}
else
{
// We successfully modified a primitive, so we must
// bump the primitive list data ID.
}
}
if (surf && surf->getVOrder() != vorder)
{
GA_NUBBasis *basis = new GA_NUBBasis(0, 1, nv+vorder, vorder, true);
if (surf->setVBasis(basis) != 0)
{
delete basis;
surf = NULL;
}
else
{
// We successfully modified a primitive, so we must
// bump the primitive list data ID.
}
}
if (surf)
{
// Nothing to more do for existing NURBS surface.
return error();
}
}
}
// 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.
// Create a NURBS surface.
GEO_PrimNURBSurf *surf = GU_PrimNURBSurf::build(gdp, nv, nu, uorder, vorder);
/// @see GEO_TPSurf for basis access methods.
for (int u = 0; u < nu; u++)
{
fpreal s = SYSfit((fpreal)u, u, (fpreal)nu-1, 0, 1);
for (int v = 0; v < nv; v++)
{
fpreal t = SYSfit((fpreal)v, v, (fpreal)nv-1, 0, 1);
UT_Vector4 P(s, 0, t, 1);
GA_Offset ptoff = surf->getPointOffset(v, u); // row, column
gdp->setPos4(ptoff, P);
}
}
// We don't need to bump any data IDs here, because they were already
// bumped in clearAndDestroy().
return error();
}