In order to use Image Based Lighting (IBL) in TurboCAD your Render Scene Luminance must include either an Environment or Simple Environment luminance. This setting is found under Options → Render Scene Luminance... from the Main Menu in TurboCAD. To get you started, SOFTBOX (HDRI) includes six luminance presets that can be assigned to the Render Scene Luminance.
There are two quick ways to apply a luminance preset to your scene in TurboCAD.
Go to Options → Render Scene Luminance... from the Main Menu and select SOFTBOX (HDRI) from the "Category" dropdown and then select a luminance preset from the "Luminance" dropdown.
With your scene open for rendering in TurboCAD, bring up the SOFTBOX (HDRI) category in the Luminance Palette and double click one of the available presets. When doing this be sure that there are no objects currently selected in your scene, otherwise you will be applying the luminance directly to the selected objects rather that the scene.
This preset will provide the fastest rendering results. It is best to use this preset when testing how your lighting setup affects the shading and reflection on your subject. Shadows have been disabled improve render speed, so the results will likely never be satisfactory enough for use as a final render. The upside is less time required in positioning your subjects, camera and cubical map assignments.
This preset is the same as the previous preset but with shadows enabled. You'll still get fairly fast render times but with the ability to see where shadows are falling in the scene. You will likely notice shadows shooting off in several directions even if only a single image is assigned to your cubical map. This is a direct result of the "Number of Samples" setting in the luminance. Using a higher quality preset will diminish this effect.
This is a good place to start for a final render. The standard preset uses a higher number of samples than the draft presets do. This will smooth out the shading gradients and clean up the shadows quite a bit. The shadows will be harder than with the higher quality presets but render times will be more favorable. Depending on the scene, this preset may work well to provide a final render.
In many cases the quality preset will work great for your final render. The number of samples have been increased to soften the shadows and provide even smoother shading. Depending on the complexity of the scene and the materials used this preset could required plenty of time to complete.
If the quality preset doesn't quite smooth out the shadows to your liking, you can use the quality plus preset. This will require longer yet rendering times. In comparing the quality and quality plus images you can see largest improvement in the shadows around the handles and on the floor. They are certainly acceptable with the quality preset, but for even softer shadows you'll want to use quality plus.
If you still aren't getting nice smooth shadows go for the presentation preset. Of course you can create your own luminance with an even higher number of samples, but watch out for unnecessarily long render times.