You can create custom dependency graph nodes, which carry out custom operations based on their incoming data. Each node type you write can be added to the agent dependency graph.
This is an example of a node that returns the intersection between a ray and an height field.
| Code Block |
|---|
|
#include <AtomsGraph/Globals.h>
#include <Atoms/Globals.h>
#include <AtomsGraph/Ports.h>
#include <AtomsGraph/NodeFactory.h>
#include <Atoms/HeightFields.h>
#include <Atoms/HeightField.h>
class HeighFieldIntersectorNode :
|
...
public AtomsGraph::Node
{
|
...
...
...
HeighFieldIntersectorNode();
|
...
virtual ~HeighFieldIntersectorNode();
|
...
...
...
AtomsGraph::StringPort *m_heightFieldNamePort;
|
...
AtomsGraph::VectorPort *m_rayOriginPort;
|
...
AtomsGraph::VectorPort *m_rayDirectionPort;
|
...
AtomsGraph::VectorPort *m_outPositionPort;
|
...
AtomsGraph::VectorPort *m_outNormalPort;
};
|
| Code Block |
|---|
|
#include "HeighFieldIntersectorNode.h"
#include <Atoms/MeshHeightField.h>
#define HEIGHTFIELDINTERSECTOR_NODE_ID 999999 // this must be unique
NODE_STANDARD_MEMBERS_IMPL(HeighFieldIntersectorNode)
unsigned int HeighFieldIntersectorNode::staticTypeId() { return HEIGHTFIELDINTERSECTOR_NODE_ID; }
std::string HeighFieldIntersectorNode::staticTypeStr() { return std::string("HeighFieldIntersectorNode"); }
HeighFieldIntersectorNode::HeighFieldIntersectorNode()
{
m_heightFieldNamePort = new AtomsGraph::StringPort("heightField");
m_rayOriginPort = new AtomsGraph::VectorPort("rayOrigin");
m_rayDirectionPort = new AtomsGraph::VectorPort("rayDirection");
m_outPositionPort = new AtomsGraph::VectorPort("outPosition");
m_outNormalPort = new AtomsGraph::VectorPort("outNormal");
// add input and output ports
addInputPort(m_heightFieldNamePort);
addInputPort(m_rayOriginPort);
addInputPort(m_rayDirectionPort);
addOutputPort(m_outPositionPort);
addOutputPort(m_outNormalPort);
}
HeighFieldIntersectorNode::~HeighFieldIntersectorNode()
{
// the parent destructor automatically deletes all the ports so we don't need to delete them here
}
bool HeighFieldIntersectorNode::compute()
{
Atoms::HeightFields& fields = Atoms::HeightFields::instance();
// get the height field name from the input port
const std::string& heightFieldName = m_heightFieldNamePort->getRef();
// check if the height field exist
|
...
auto heightField = fields.heightField(heightFieldName);
Atoms::MeshHeightField* meshHf = nullptr;
if ( |
...
heightField && heightField->typeId() == Atoms::MeshHeightField::staticTypeId())
{
|
...
meshHf = static_cast<Atoms::MeshHeightField*>(heightField.get());
}
if (!meshHf)
return false;
// compute the intersection
Atoms::HeightField::HitResult hitResult;
if ( |
...
meshHf->intersect(m_rayOriginPort->getRef(), m_rayDirectionPort->getRef(), |
...
...
false))
{
AtomsCore::Vector3 projectedPos = m_rayOriginPort->getRef() + double( |
...
hitResult.t) * m_rayDirectionPort->getRef();
// compute the normal from the barycentric coords of the intersection
std::vector<AtomsCore::Vector3f> &normals = |
...
meshHf->mesh().normals();
AtomsCore::Vector3 hfNormal = |
...
hitResult.uv.x * normals[hitResult.faceId * 3] + |
...
hitResult.uv.y * normals[hitResult.faceId * 3 + 1] + (1.0f - |
...
...
hitResult.uv.y) * normals[hitResult.faceId * 3 + 2];
hfNormal.normalize();
// set the output ports
m_outPositionPort->set(projectedPos);
m_outNormalPort->set(hfNormal);
}
|
...
Register the new node to the factory
| Code Block |
|---|
#include "HeighFieldIntersectorNode.h"
void |
...
FAtomsUnrealTestGameModule::StartupModule()
|
...
...
...
...
AtomsGraph::NodeFactory& manager = AtomsGraph::NodeFactory::instance();
|
...
manager.registerNode(HeighFieldIntersectorNode::staticTypeStr(), &HeighFieldIntersectorNode::creator) |
...
...
...
FAtomsUnrealTestGameModule::ShutdownModule() |
...
...
...
...
...
AtomsGraph::NodeFactory& manager = AtomsGraph::NodeFactory::instance();
|
...
manager.deregisterNode(HeighFieldIntersectorNode::staticTypeStr()) |
...
...
...