Keep up-to-date with Free tutorials!!

 

Sign up to our twice-monthly newsletter today for the latest tutorials, interviews and product information.

Sign me up to receive third-party emails from 3dtotal's partners, too!

- Latest news
- Exclusive Shop Offers
- Preview early content
- Plus much more

 

Not Ready to take that step? OK, Why not just Subscribe to the RSS Feed

 
submit tutorial
1 | 2 | 3
The Dielectric Material Shader and Glass Physics Phenomena

By Rick Timmons
| Your Rating:
rating star nonerating star nonerating star nonerating star nonerating star none
(0 Votes)
| 53090 Views
| 0 Comments
| Comments 0
Date Added: 9th December 2009
Software used:
3ds Max

Our two drinking glasses are now turned to glass. It's time to return our Raytrace glasses to the scene, enable caustics and try a Quick Render to see what we've created.

Step 4: Enabling mr Caustics

1. Before enabling caustics, let's first tell mental ray which of our objects shall be generating caustics. Click anywhere in the Camera viewport where there's no object, and from the Quad Menu select Unhide All. This returns to our scene the two hidden raytrace objects.

Next, hit H to call up the Select Objects list and from this list selects the following items: Camera01, Camera01.Target and Enclosure.

Click Invert, then select. Right click on any of the three glasses, and from the Quad Menu, select Object Properties > mental ray tab, and in the Indirect Illumination section enable Generate Caustics. Click OK. Hit F10 to bring up the Render Scene dialog panel. Click the Indirect Illumination tab, and depending on the version of Max/mental ray you're using, slide down the panel to the Caustics and Global Illumination (GI) rollout. For now, enable Caustics only, leaving all other settings to their default values and hit F9.

391_tid_Pix_015.jpg
At default settings our render is quite sloppy. Let's take care of both the photon size and clarity problems before moving onward. In the Caustics group, enable Maximum Sampling Radius and set a value of 6 inches. Next, slide down the panel to the section Light Properties and increase the Average Caustic Photons per Light from 10000 to 35000. Your next Quick Render should yield a result similar to this:

391_tid_Pix_016.jpg

This would be a good point to start making further adjustments to improve the quality of the render. The last matter we need to tend to concerns the trace depth of our project, this is especially notable by the lack of caustic light in the shadow field of the raytrace glass.

On the Render Scene panel (F10), click the Indirect Illumination tab and slide down to the area Caustics and Global Illumination (GI) to the Trace Depth Section. Set the Maximum Depth to 10, Maximum Reflections to 2 and Maximum Refractions to 8. And try your Quick Render (F9) again.

391_tid_Pix_017.jpg
Which one is better? I'll leave that to you to decide. Imagine the possibilities with HDRI and/or a better background. You'll be surprised at what you can learn by experimenting with the settings to these materials. And here's a parting shot of the GPP and DMS in a real world scene. Good luck to all in your work.

391_tid_Pix_018.jpg
Rick Timmons




< previous page
 
1 | 2 | 3
Related Tutorials

Tutorial

Gallery Image.



Keywords: Blender, scene, river, water

Go to tutorial
rating star fullrating star fullrating star fullrating star fullrating star half (19)
Comments 2 Views 45307

Tutorial

Gallery Image.



Keywords: water, splash, realistic,

Go to galleries 1
rating star fullrating star fullrating star fullrating star fullrating star half
Comments 10 Views 85189

Tutorial

Gallery Image.



Keywords: hand painted, tileable, textures,

Go to galleries 1
rating star fullrating star fullrating star fullrating star fullrating star none
Comments 0 Views 13554

Tutorial

Gallery Image.



Keywords: scene, total, textures, world,

Go to galleries 1
rating star fullrating star fullrating star fullrating star fullrating star half
Comments 2 Views 106138
Readers Comments (Newest on Top)
avatar
(ID: 130130, pid: 0) Buzzy on Tue, 03 July 2012 3:10pm
Very informative for those with little or no caustics experience. Great article.
Add Your Comment