//---------------------------------------------------------------
void LightExporter::exportLights ( SceneElement* sceneElement )
{
// If we have a external reference, we don't need to export the data here.
if ( !sceneElement->getIsLocal() ) return;
if ( !sceneElement->getIsExportNode () ) return;
// Check if it is a light.
SceneElement::Type sceneElementType = sceneElement->getType();
if ( sceneElementType == SceneElement::LIGHT )
{
// Get the current dag path
MDagPath dagPath = sceneElement->getPath();
// Check if the current scene element isn't already exported.
SceneGraph* sceneGraph = mDocumentExporter->getSceneGraph();
if ( sceneGraph->findExportedElement ( dagPath ) ) return;
// Check if the current element is an instance.
// We don't need to export instances, because we export the original instanced element.
bool isInstance = ( dagPath.isInstanced() && dagPath.instanceNumber() > 0 );
// If the original instanced element isn't already exported, we have to export it now.
if ( isInstance )
{
// Get the original instanced element.
MDagPath instancedPath;
dagPath.getPath ( instancedPath, 0 );
// Check if the original instanced element is already exported.
SceneGraph* sceneGraph = mDocumentExporter->getSceneGraph();
SceneElement* exportedElement = sceneGraph->findExportedElement ( instancedPath );
if (exportedElement == 0)
{
// Export the original instanced element and push it in the exported scene graph.
if (exportLight(instancedPath))
{
SceneElement* instancedSceneElement = sceneGraph->findElement(instancedPath);
SceneGraph* sceneGraph = mDocumentExporter->getSceneGraph();
sceneGraph->addExportedElement(instancedSceneElement);
}
}
}
else
{
// Export the element and push it in the exported scene graph.
if ( exportLight ( dagPath ) )
{
SceneGraph* sceneGraph = mDocumentExporter->getSceneGraph();
sceneGraph->addExportedElement( sceneElement );
}
}
}
// Recursive call for all the child elements
for ( uint i=0; i<sceneElement->getChildCount(); ++i )
{
SceneElement* childElement = sceneElement->getChild ( i );
exportLights ( childElement );
}
}
// ------------------------------------
bool LightExporter::exportLight ( const MDagPath& dagPath )
{
if ( !ExportOptions::exportLights() ) return false;
MObject lightNode = dagPath.node();
// Retrieve the Maya light object
MStatus status;
MFnLight lightFn(lightNode, &status); CHECK_STAT(status);
if (status != MStatus::kSuccess) return false;
// Get the maya light id.
String mayaLightId = mDocumentExporter->dagPathToColladaId ( dagPath );
// Generate a COLLADA id for the new object
String colladaLightId;
// Check if there is an extra attribute "colladaId" and use this as export id.
MString attributeValue;
DagHelper::getPlugValue ( lightNode, COLLADA_ID_ATTRIBUTE_NAME, attributeValue );
if ( attributeValue != EMPTY_CSTRING )
{
// Generate a valid collada name, if necessary.
colladaLightId = mDocumentExporter->mayaNameToColladaName ( attributeValue, false );
}
else
{
// Generate a COLLADA id for the new object
colladaLightId = mDocumentExporter->dagPathToColladaId ( dagPath );
}
// Make the id unique and store it in a map.
colladaLightId = mLightIdList.addId ( colladaLightId );
mMayaIdColladaIdMap [ mayaLightId ] = colladaLightId;
// Get a pointer to the stream writer.
COLLADASW::StreamWriter* streamWriter = mDocumentExporter->getStreamWriter();
// The light name
String lightName = mDocumentExporter->dagPathToColladaName ( dagPath );
// Figure out the type of light and create it
COLLADASW::Light* light = NULL;
MFn::Type type = lightNode.apiType();
switch (type)
{
case MFn::kAmbientLight:
light = new COLLADASW::AmbientLight( streamWriter, colladaLightId, lightName );
break;
case MFn::kDirectionalLight:
light = new COLLADASW::DirectionalLight( streamWriter, colladaLightId, lightName );
break;
case MFn::kSpotLight:
light = new COLLADASW::SpotLight( streamWriter, colladaLightId, lightName );
break;
case MFn::kPointLight: // Intentional pass-through
default:
light = new COLLADASW::PointLight( streamWriter, colladaLightId, lightName );
break;
}
// Export the original maya name.
light->addExtraTechniqueParameter ( PROFILE_MAYA, PARAMETER_MAYA_ID, mayaLightId );
// Get a pointer to the animation exporter.
AnimationExporter* anim = mDocumentExporter->getAnimationExporter();
bool animated = false;
// Color/Intensity are the common attributes of all lights
MColor mayaColor = lightFn.color ( &status ); CHECK_STAT(status);
COLLADASW::Color lightColor ( mayaColor.r, mayaColor.g, mayaColor.b, mayaColor.a );
animated = anim->addNodeAnimation ( lightNode, ATTR_COLOR, kColour, RGBA_PARAMETERS );
light->setColor( lightColor, animated );
float intensity = lightFn.intensity ( &status ); CHECK_STAT(status);
animated = anim->addNodeAnimation ( lightNode, ATTR_INTENSITY, kSingle );
light->setIntensity( intensity, animated );
// Export light intensity
light->addExtraTechniqueParameter(PROFILE_MAYA, ATTR_INTENSITY, intensity);
// Add the type specific attributes
if (lightNode.hasFn(MFn::kNonAmbientLight))
{
// Needed Point and Spot light types parameters: Attenuation and Attenuation_Scale
// Attenuation in COLLADA is equal to Decay in Maya.
MFnNonAmbientLight naLightFn(lightNode);
int decayRate = naLightFn.decayRate(&status); CHECK_STAT(status);
decayRate = std::min ( decayRate, 2 );
decayRate = std::max ( decayRate, 0 );
light->setConstantAttenuation ( ( decayRate == 0 ) ? 1.0f : 0.0f);
light->setLinearAttenuation ( ( decayRate == 1 ) ? 1.0f : 0.0f);
light->setQuadraticAttenuation ( ( decayRate == 2 ) ? 1.0f : 0.0f);
}
else if (lightNode.hasFn(MFn::kAmbientLight))
{
MFnAmbientLight ambientLightFn ( lightNode );
float ambientShade = ambientLightFn.ambientShade();
String paramSid = EMPTY_STRING;
animated = anim->addNodeAnimation ( lightNode, ATTR_AMBIENT_SHADE, kSingle );
if ( animated ) paramSid = ATTR_AMBIENT_SHADE;
light->addExtraTechniqueParameter ( PROFILE_MAYA, MAYA_AMBIENTSHADE_LIGHT_PARAMETER, ambientShade, paramSid );
}
if (lightNode.hasFn(MFn::kSpotLight))
{
// Put in the needed spot light type attributes : Falloff, Falloff_Scale and Angle
MFnSpotLight spotFn(lightNode);
float fallOffAngle = COLLADABU::Math::Utils::radToDegF ( (float)spotFn.coneAngle( &status ) ); CHECK_STAT(status);
animated = anim->addNodeAnimation ( lightNode, ATTR_CONE_ANGLE, ( SampleType ) ( kSingle | kAngle ) );
light->setFallOffAngle ( fallOffAngle, animated );
light->setFallOffExponent ( 1.0f );
float penumbraValue = COLLADABU::Math::Utils::radToDegF ( (float)spotFn.penumbraAngle( &status ) ); CHECK_STAT(status);
animated = anim->addNodeAnimation ( lightNode, ATTR_PENUMBRA_ANGLE, ( SampleType ) ( kSingle | kAngle ) );
// Export spot setting
float dropOff = (float)spotFn.dropOff(&status); CHECK_STAT(status);
light->addExtraTechniqueParameter(PROFILE_MAYA, MAYA_PENUMBRA_LIGHT_PARAMETER, penumbraValue);
light->addExtraTechniqueParameter(PROFILE_MAYA, MAYA_DROPOFF_LIGHT_PARAMETER, dropOff);
// TODO
// FCDLightTools::LoadPenumbra(light, penumbraValue, colladaLight->GetOuterAngle().GetAnimated());
// TODO
// animated = anim->addNodeAnimation ( lightNode, ATTR_DROP_OFF, kSingle );
// light->setDropOff ( (float) spotFn.dropOff ( &status ), animated ); CHECK_MSTATUS(status);
}
SceneElement* sceneElement = NULL;
SceneGraph* sceneGraph = mDocumentExporter->getSceneGraph();
sceneElement = sceneGraph->findElement(dagPath);
exportExtraAttributes(sceneElement, light);
addLight ( *light );
delete light;
return true;
}
