Home » Tip of The Day » Rendering With Selections: Render Only Part of Your 3D ObjectRendering With Selections: Render Only Part of Your 3D Object April 20, 2016. Posted in: Tip Of The Day. To save time when checking a 3D object’s shadow or reflection in Photoshop 3D, you can render only just a selected part of your 3D object by making a marquee selection around the area that you want to render, then click on the render button. « Previous Photoshop Tip: | Next Photoshop Tip: » Sign-up for the PTC Newsletter so that you'll never miss a tutorial!. Your Email Address: