bool
_ReadToCamera(
const UsdGeomCamera& usdCamera,
MFnCamera& cameraFn,
const UsdMayaPrimReaderArgs& args,
UsdMayaPrimReaderContext* context)
{
MStatus status;
// Now translate all of the USD camera attributes over to plugs on the
// Maya cameraFn.
UsdTimeCode timeCode = UsdTimeCode::EarliestTime();
UsdAttribute usdAttr;
TfToken plugName;
// Set the type of projection. This is NOT keyable in Maya.
TfToken projection;
usdCamera.GetProjectionAttr().Get(&projection, timeCode);
const bool isOrthographic = (projection == UsdGeomTokens->orthographic);
status = cameraFn.setIsOrtho(isOrthographic);
CHECK_MSTATUS_AND_RETURN(status, false);
// Setup the aperture.
usdAttr = usdCamera.GetHorizontalApertureAttr();
plugName = _tokens->MayaCameraAttrNameHorizontalAperture;
if (!_TranslateUsdAttributeToPlug(usdAttr, cameraFn, plugName,
args, context,
/* convertToUnit = */ MDistance::kInches)) {
return false;
}
if (isOrthographic) {
// For orthographic cameras, we'll re-use the horizontal aperture value
// to fill in Maya's orthographicWidth. The film aperture and film
// aperture offset plugs in Maya have no effect on orthographic cameras,
// but we author them anyway so that the data is preserved. Note also
// that Maya stores the orthographicWidth as centimeters.
plugName = _tokens->MayaCameraAttrNameOrthographicWidth;
if (!_TranslateUsdAttributeToPlug(usdAttr, cameraFn, plugName,
args, context,
/* convertToUnit = */ MDistance::kCentimeters)) {
return false;
}
}
usdAttr = usdCamera.GetVerticalApertureAttr();
plugName = _tokens->MayaCameraAttrNameVerticalAperture;
if (!_TranslateUsdAttributeToPlug(usdAttr, cameraFn, plugName,
args, context,
/* convertToUnit = */ MDistance::kInches)) {
return false;
}
// XXX:
// Lens Squeeze Ratio is DEPRECATED on USD schema.
// Writing it out here for backwards compatibility (see bug 123124).
cameraFn.setLensSqueezeRatio(1.0);
usdAttr = usdCamera.GetHorizontalApertureOffsetAttr();
plugName = _tokens->MayaCameraAttrNameHorizontalApertureOffset;
if (!_TranslateUsdAttributeToPlug(usdAttr, cameraFn, plugName,
args, context,
/* convertToUnit = */ MDistance::kInches)) {
return false;
}
usdAttr = usdCamera.GetVerticalApertureOffsetAttr();
plugName = _tokens->MayaCameraAttrNameVerticalApertureOffset;
if (!_TranslateUsdAttributeToPlug(usdAttr, cameraFn, plugName,
args, context,
/* convertToUnit = */ MDistance::kInches)) {
return false;
}
// Set the lens parameters.
usdAttr = usdCamera.GetFocalLengthAttr();
plugName = _tokens->MayaCameraAttrNameFocalLength;
if (!_TranslateUsdAttributeToPlug(usdAttr, cameraFn, plugName,
args, context)) {
return false;
}
usdAttr = usdCamera.GetFocusDistanceAttr();
plugName = _tokens->MayaCameraAttrNameFocusDistance;
if (!_TranslateUsdAttributeToPlug(usdAttr, cameraFn, plugName,
args, context)) {
return false;
}
usdAttr = usdCamera.GetFStopAttr();
plugName = _tokens->MayaCameraAttrNameFStop;
if (!_TranslateUsdAttributeToPlug(usdAttr, cameraFn, plugName,
args, context)) {
return false;
}
// Set the clipping planes. This one is a little different from the others
// because it is stored in USD as a single GfVec2f value but in Maya as
// separate nearClipPlane and farClipPlane attributes.
usdAttr = usdCamera.GetClippingRangeAttr();
MPlug nearClipPlug = cameraFn.findPlug(
_tokens->MayaCameraAttrNameNearClippingPlane.GetText(), true, &status);
CHECK_MSTATUS_AND_RETURN(status, false);
MPlug farClipPlug = cameraFn.findPlug(
_tokens->MayaCameraAttrNameFarClippingPlane.GetText(), true, &status);
CHECK_MSTATUS_AND_RETURN(status, false);
if (!_TranslateAnimatedUsdAttributeToPlugs(usdAttr,
nearClipPlug,
farClipPlug,
args,
context)) {
GfVec2f clippingRange;
usdCamera.GetClippingRangeAttr().Get(&clippingRange, timeCode);
status = cameraFn.setNearClippingPlane(clippingRange[0]);
CHECK_MSTATUS_AND_RETURN(status, false);
status = cameraFn.setFarClippingPlane(clippingRange[1]);
CHECK_MSTATUS_AND_RETURN(status, false);
}
return true;
}
MObject create(Alembic::AbcGeom::ICamera & iNode, MObject & iParent)
{
Alembic::AbcGeom::ICameraSchema schema = iNode.getSchema();
MString name(iNode.getName().c_str());
MFnCamera fnCamera;
MObject obj = fnCamera.create(iParent);
fnCamera.setName(name);
// we need to read this to determine the film fit
Alembic::AbcGeom::CameraSample samp;
iNode.getSchema().get(samp);
std::size_t numOps = samp.getNumOps();
if (numOps > 0)
{
std::string hint = samp[0].getHint();
if (hint == "filmFitFill")
{
fnCamera.setFilmFit(MFnCamera::kFillFilmFit);
}
else if (hint == "filmFitHorz")
{
fnCamera.setFilmFit(MFnCamera::kHorizontalFilmFit);
}
else if (hint == "filmFitVert")
{
fnCamera.setFilmFit(MFnCamera::kVerticalFilmFit);
}
else if (hint == "filmFitOver")
{
fnCamera.setFilmFit(MFnCamera::kOverscanFilmFit);
}
}
if (schema.isConstant())
{
// no center of interest
fnCamera.setFocalLength(samp.getFocalLength());
fnCamera.setLensSqueezeRatio(samp.getLensSqueezeRatio());
// camera scale might be in the 3x3
// weirdo attrs that are in inches
fnCamera.setHorizontalFilmAperture(samp.getHorizontalAperture()/2.54);
fnCamera.setVerticalFilmAperture(samp.getVerticalAperture()/2.54);
fnCamera.setHorizontalFilmOffset(samp.getHorizontalFilmOffset()/2.54);
fnCamera.setVerticalFilmOffset(samp.getVerticalFilmOffset()/2.54);
// film fit offset might be in the 3x3
if (samp.getOverScanLeft() == samp.getOverScanRight() &&
samp.getOverScanTop() == samp.getOverScanBottom() &&
samp.getOverScanLeft() == samp.getOverScanTop())
{
fnCamera.setOverscan(samp.getOverScanLeft() + 1.0);
}
else
{
MString warn = iNode.getName().c_str();
warn += " has unsupported overscan values.";
MGlobal::displayWarning(warn);
}
fnCamera.setNearClippingPlane(samp.getNearClippingPlane());
fnCamera.setFarClippingPlane(samp.getFarClippingPlane());
// prescale, film translate H, V, roll pivot H,V, film roll value
// post scale might be in the 3x3
fnCamera.setFStop(samp.getFStop());
fnCamera.setFocusDistance(samp.getFocusDistance());
MTime sec(1.0, MTime::kSeconds);
fnCamera.setShutterAngle(Alembic::AbcGeom::DegreesToRadians(
360.0 * (samp.getShutterClose()-samp.getShutterOpen()) *
sec.as(MTime::uiUnit()) ));
for (std::size_t i = 0; i < numOps; ++i)
{
Alembic::AbcGeom::FilmBackXformOp & op = samp[i];
if (op.getHint() == "filmFitOffs")
{
double val = op.getChannelValue(0) *
samp.getHorizontalAperture() / 5.08;
if (val != 0.0)
{
fnCamera.setFilmFitOffset(val);
}
else
{
fnCamera.setFilmFitOffset(op.getChannelValue(1) *
samp.getHorizontalAperture() / 5.08);
}
}
else if (op.getHint() == "preScale")
{
fnCamera.setPreScale(1.0/op.getChannelValue(0));
}
else if (op.getHint() == "filmTranslate")
{
fnCamera.setFilmTranslateH(op.getChannelValue(0));
fnCamera.setFilmTranslateV(op.getChannelValue(1));
}
else if (op.getHint() == "postScale")
{
fnCamera.setPostScale(1.0/op.getChannelValue(0));
}
else if (op.getHint() == "cameraScale")
{
fnCamera.setCameraScale(op.getChannelValue(0));
}
}
}
// extra transform node is unfortuneatly automatically created above the
// camera, let's do some reparenting and delete that extra transform
MDagPath path;
fnCamera.getPath(path);
MObject camObj = path.node();
MDagModifier dagMod;
dagMod.reparentNode(camObj, iParent);
dagMod.doIt();
dagMod.deleteNode(obj);
dagMod.doIt();
return camObj;
}
