In the YafRay GI tab, select 'Full' as your method, and 'Low' quality (that's good enough for a preview).Go to the YafRay tab and deactivate the XML button and set Exp (the exposure control) to 1.5.Press F10 and change the 'Blender Internal' to 'YafRay'. To be able to render using this environment, you need to enable YafRay.Click the 'Load Image' button and locate your HDR image.Now go to the Texture settings (press F6) and change the 'Texture Type' to 'Image'.Then go to the 'Map To' tab and deactivate 'Blend' and activate 'Hori'.In the 'Texture and Input' tab, click 'Add New' and 'Angmap'.Go to the shading settings (press F5) and click the World button.To apply the HDRI environment to your scene: uncheck 'save all components of the assembly into a single file'.You'll be able to scale the model again once you're in Blender. Usually you need to set the unit to something bigger than millimeters normally centimeters will do, but for the bigger models I advice you to set the unit to meters. Select VRML as your file-type and click on the 'Options.' button.Take into account, however, that a higher value means a bigger file and slower operations within Blender. Especially for complex shapes with a lot of curvature, you'll probably want a higher value. If your model looks faceted in your viewport, just set the 'Shaded and draft quality HLR/HLV resolution' to a higher value. To improve this, go to Tools > Options > Document Properties tab > Image Quality. The export quality (strangely enough) depends on the screen settings.

If you don't want to export all the objects, suppress the objects you don't want to export first.

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