UK - 01926 333777
ROI - 01 297 4440
Search
01926 333777
SOLIDWORKS Elite Specialists

It's All Gone Dark?!?

Monday June 16, 2014 at 12:24am
 
One common question on photo-rendering is when you have clear objects why may you get dark spots?

The answer is down to the fact that in real life light bends as many times as it needs to pass through a transparent object. However in rendering we have to limit this number of bends (known as refractions) for performance reasons. This is particularly a problem where you have many transparent layers such as a point of sale display.

In PhotoView 360 the number of refractions (bends) goes up as you increase the Final render quality (Render Tools -> PhotoView Options) 



However this also increases the number of reflections + some other settings which significantly slow the render and at a certain point you may run out, for instance even at maximum quality you only get 10 refractions, Even for 3 glasses lined up this would not be sufficient.

Good Quality (4 refractions)


Maximum Quality (10 refractions)



Even at maximum quality we do not get the result we want, the diagram below indicates why. 12 refractions (bends) are required in order to let light pass through all three glasses (entry and exit face, front and back of each glass).



As a guide going up a quality level generally at least doubles the render time with each step. So if a render takes 1 min at good quality it might take 2 or 3 minutes at better and perhaps 6-10 minutes at best quality and so on.  

My advice for most renderings is to leave the quality at Better and instead tick “custom render settings”, here you can manually set the number of reflections and refractions. This is much more efficient than just bumping the quality up and up.  



Custom options for 12 refractions


By Alan Sweetenham
Applications Engineer

Related Blog Posts

Custom Settings - Collated Quick Tips
We’ve collated some of our favourite tips on how you can customise your SOLIDWORKS interface to suit your preferences along with aiding your efficiency…
Creating Interactive Animations with SOLIDWORKS
Interactive Images are a great export option within Visualize Professional, allowing you to view the model in a series of 360 orbital spins within a web browser. However, what happens if I want to use this interactive method to demonstrate a mechanis...
Working with Imported Geometry Webcast Series
SOLIDWORKS is able to import and edit a large number of different CAD file formats, this webcast series aims to explain what you need to know to make this process as smooth and efficient as possible.
Top