I want a gizmo/group to error in certain circumstances (based on
something happening in knobChanged callback, most likely)
Normally I'd do this by having an Assert node just before Output, and
give it an expression like so:
[string length [value parent.errormsg]] == 0
..then set the hidden "errormsg" knob to something (or clear it)
This works fine for a node which outputs an image.. but the node can
output anything (2D/deep/3D), while the Assert node forces the output ot
be a 2D op (meaning the group cannot output, say, a camera)
So, my plan was to create a node like the NoOp, which calls the
Op::error() with a supplied string.. but I'm not sure how to go about
creating a NoOp like node. Just inheriting from Op seems like the right
starting point, but I'm not sure what else I need to do to make it
connectible to "anything"?
#include "DDImage/Op.h"
#include "DDImage/Description.h"
using namespace DD::Image;
static const char* const CLASS = "Errorify";
static const char* const HELP = "...";
class Errorify : public Op
{
public:
Errorify(Node* node)
: Op(node)
{
}
void _validate(bool for_real)
{
error("Testing!");
}
static const Op::Description d;
const char* Class() const { return d.name; }
const char* node_help() const { return HELP; }
};
static DD::Image::Op* build(Node* node) { return new Errorify(node); }
const Op::Description Errorify::d(CLASS, 0, build);
--
ben dickson
2D TD | [email protected]
rising sun pictures | www.rsp.com.au
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