2D Volumetric rays in nuke

-
2D Volumetric rays

Here i'm going to explain Creating 2D Volumetric rays in nuke.


As a compositor and 3D artist every one really love Volumetric rays. Creating Volumetric rays in 3D packages such as Maya, 3dMax and any other 3D software’s are quit expensive. Its took long time to render for producing nice Volumetric rays.

Creating 2D Volumetric rays doesn’t look nice like rendered in 3D packages. But we can save some valuable times by create this effect in 2D.

You can create nice Volumetric rays effect like above image in Nuke. I used "Godrays" "Noise" and "roto" nodes to produce above result.

Here we go............

Step-1. Import image into nuke.

Step-2. Draw a roto shape to the light. If you have matte (alpha) will use that
            instead off roto.


Step-3. Add "GodRays" node and connect it to "roto" node. Move the center point
            to the opposite  direction off rays direction. Here i placed the center
            point to the left upper side of the image.


Step-4. Change the "GodRays" scale value. I set 4.5 as scale value.
            GodRays default scale value is 1. ( change as per your need )

            This will give you blow result:



Step-5. Change the "steps" knob value to 8 will give you the below nice and
            smooth result.


Step-6. Composite this result with input.


It looks nice. But.... hold on a second. I like to fade off my rays when its reaches the ground. How to do that.

Here is the solution.

Step-7. Again go to GodRays and adjust the "knob" called 'to color'.


Reduced 'to color' knob value will give below result:

 Now its look really nice and fallen off. But its not the final result, you showed first??.

How to create the breakups on the rays. Means lights breaking through some objects. In 3D packages will add some objects for light cut through that. But how to mimic that effect in 2D.

Its really simple one. Artistic approach will help us to mimic this effect.

Step-8. Create a 'Noise' node and multiply it with the "roto" node.


This will give you the below final result:


Adjust the noise value as per your need.

You  can change the rays color by adjusting color value of 'from color' and 'to color' knob on GodRays node.

example:


Multiple roto shapes will produce some nice Volumetric rays.


One more example:





Hope this will help you guys.

Nuke file: https://skydrive.live.com/redir?resid=776F8351D9892B6A!270



Comments

Post a Comment

Popular posts from this blog

Export Nuke's retime information

-
Image
Export Nuke's retime information To 3D packages: This is happen while working with production. In most cases retiming is done beforehand or at the end of a comp. Some time shots getting retimed after Match-move is done. By that time Nuke's retime data (curve) will help to match the tracked camera to new retimed plate. Here is the trick to export nuke's retime date (curve) to 3D packages such as maya, max, Houdini etc. Here im explaining how to export nuke's retime curve to maya. Constant re-speed. I want to retime my input by 200%. Add a retime node and change the speed to 2. Don't forget to change the filter option to None . Retime node doesn't generate retime curve at all. So note down the output range. It changed from original range 1001 - 1042 to 1001 - 1021. Which means our input ended with 1021. Add a TimeWarp node and set keyFrames based on our retime output result. Set a key frame at 1001 as 1001 in input frame knob. Got
Read more

Working with UV pass inside NUKE

-
Image
Working with UV pass inside NUKE UV pass will allow you to re-texture surfaces and add some elements ( like text, batches, picture frame ) later in the compositing stage. Here i place my name on the surface and apply motion blur inside nuke. Creating UV pass inside MAYA: Maya 2012 have inbuilt UV render pass. Open up render settings under Passes tab select create render passes and choose UVpass and add. Maya->Render Settings->Passes->UVpass If you want to create custom UV pass Follow below link. http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=13481445&linkID=9242258 Enable float values for rendering For render UV pass from MAYA you must change your colour bit depth from the standard RGBA 4x8Bits per channel to RGBA (Float) 4x32 Bit (full float). Open up your 'Render Settings' and at the bottom of the 'Quality' tab change the 'Date Type' to 'RGBA (Float) 4x32 Bit. choosing File format f
Read more

DeepEdgeSmoother

-
Image
DeepEdgeSmoother Deep compositing became day to day work in many compositing studios around the world. Nuke having couple of Deep nodes to do Deep compositings. But Nuke still lagging Deep edge manipulating  nodes like edgeBlur, erode etc. I have faced many issues with blending edges while merging Deep inputs with 2D plates. Edge looks too sharp in many cases even there is Deep holdout.  DeepEdgeSmoother is applying softness on both end of Deep layer (Deep front and Deep back). Before: After: This gizmo add smoothness on both end of deep data to blend the edges more naturally. I hope this will help you guys. Download here: DeepEdgeSmoother
Read more