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; }