Category: Lighting

Physically Plausible Shading

Here’s a couple of videos explaining physically plausible shading and the advantages over the older methods. For instance if you are clamping your HDRs to 8 bit or blurring environment maps to cheat noise artifacts when using raytracing – these vids explain the improvements to be found using PPS. They are part of a 16 hour course for Renderman Studio 4.0 – which ships with ‘plausible’ shaders. At the moment the free version of (3Delight Studio Pro version 10.0.50).doesn’t have the shader’s- have no idea if the paid version includes them or when

https://www.youtube.com/watch?v=b8LFBX4x4qE

Here’s a PDF illustrating the talk that Christos Obretenov gives in the video

Here’s a PDF on Physically-Based Shading at Disney

Here’s a related tutorial youtube clip from Mark Flanagan – along with some more quick tutorials for Renderman Studio. Thanks for the comments Mark

 

OpenEXR v2.0.0 Released

Hi All, Tuesday, April 9th, 2013 OpenEXR v2.0.0 has been released and is available for download. The release includes a number of new features that align with the major version number increase. Amongst the major improvements are: Deep Data support – Pixels can now store a variable-length list of samples. The main rationale behind deep…

Notes on Using Sun and Sky.

This only works in the 3delight for Maya Plugin and not currently in the 3delight Studio Pro Package. works in both now

3delight has shipped with a sun and sky shader for a while, but there have been issues around them (which I believe the developers are looking into). Now with the support for the MR shaders its easy to get something setup quickly and with the use of scripts to modify the time of day, year, location etc.

Ok first thing make sure that you’ve got Mental Ray plugin loaded
Window –> Settings/Prefrences –> Plug-in Manager, find in the list Mayatomr.mll and check Loaded is Autoload.
go to Window –> Rendering Editors –> Render Settings . Change drop down menu ‘Render Using’ to Mental Ray

From the ‘Indirect Lighting’ tab create a ‘Physical Sun and Sky’
In the Maya Outliner you can now see a ‘Sun Directional light has been created and in the utilities of the hypershade there is a mia exposure, mia physical sky and mia physical sun. There are mel scripts available to change the directional light based on the time, julien day etc. I recommend to download the ‘TOI’ set of tools to do this.
Create a 3delight pass , turn on global illumination in the render setting with add to final mix. Heres some quick and nasty renders.

This one was overblown so I tweaked the shading multiplier in the mia_physicalsky

Heres one with a change of time using the TOI script

In addition I would look at modifying the directional light and shadows color temperature based on the time of day. These images don’t feature any aerial perspective shading. The viewer would normally expect to see destauration based on distance – dependent on time of day again.

PTC BASED INDIRECTDIFFUSE – COLOUR BLEED

Bumped this over from the 3delight forum as well. Cheers Baopao This is my way for ptc based indirectdiffuse() with 3dl 9.0.0. http://www.alessandrodallafontana.com/p … p_mall.htm here you will find 3 shaders. I use standard maya shader. I create a render pass for bake with in PreWorldMel: RiAttribute -n “cull” -p “hidden” “integer” “0” -p “backfacing”…

Sorbetto Relighting Tool

Ok if you don’t have access to Pixar relighting toolset lpics like this…Sorbetto is a nice relighting tool which seems to be similar. It comes as part of the Gelato renderer. Its FREE so no harm in giving it a go…A proviso is you will need to have a suitable nvidia graphics card.