Few Questions

few questions:
1) How to import exr layers in photoshop?
ans: Some plugins like proExr helps to do that in PScs5 extended version.
       for more details:
 http://www.fnordware.com/ProEXR/
2)How to render layers in seperate files in Houdini
      create seperate mantra nodes to do this.
3)How to render out material mattes in Houdini..
  In the shop network add parameter,set export to when input is connected,create a constant,,set type to color (1,1,1).Connect costant to parameter.
  Point the name of parameter in image plane in the rop (eg. treeMatte) ...and bingo .u have matte as seperate layer..

4)How to assign different materials in different takes ?
   Create a shader, go to the take and in the object point the shop to the different material.

5)How to improve anti aliasing in Houdini renders ?

6)Linear workflow in Houdini

http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=13627

 https://vimeo.com/42486306

http://www.deborahrfowler.com/HoudiniResources/HoudiniLinear.html

7)Triplanar Projection:

  http://http.developer.nvidia.com/GPUGems3/gpugems3_ch01.html

 http://forums.odforce.net/index.php?/topic/16884-material-projection/

http://www.gamedev.net/topic/621962-using-normal-mapping-with-triplanar-texture-projection/

8) How to delete parts on zbrush.

     Mask the area u want to delete (cltr+shift marquee select), invert it (cltr+shift marque select outside).It ll make areas u want to delete as hidden.

     now go to ..Geometry> modify topology> delete hidden.

9)How to setup Volume Fog in Houdini...??
  Create an atmosphere node,create lit_fog in shop.Connect atmosphere node to lit fog shader.Render the light with depth map shadow.

10) How to shatter more along the curve drawn on surface ?
      transfer the color(Cd), add scatter node after attrib transfer, in scatter Alternate attribute type Cd and set mode to multiplication of probablity.
  To have more chunks along the curve, create second curve (using vop sop), merge them, skin them, convert to poly, now add the poly to attribtransfer for scatter node.

11) How to download videos from youtube ?
    after www. type www.ssNameOfVid ...this takes u to the link ..which has different format video ...and bingo u ..have it ?...

Bump And Image Displacement Basic NetWork..

                                     Basic Bump Network

                                  Basic Image Displacement Node

Harmonica Bends :P

Not ..Cg exactly but Harmonica ...
Thought i ll loose the link ...:P
http://www.harmonicalessons.com/improv_riffs.html

Flatten an object in uv space in Mudbox

Flatten an object in uv space  in Mudbox...
Shortcut-Alt+T
Mesh>Flatten to UV space..
It can be used to fill up the base textures on the object ..make sure we have tiling option on the stencil settings while painting.

http://my.safaribooksonline.com/book/-/9781849691567/5dot-get-in-and-get-out/id286767779

Repeat UV in houdini

add a parameter (type int)..multiply with s/t and plug to s/t of surface color ..

All about instancing in Houdini..

Here is the link to understanding instancing , randomizing rotation,scale,change instances and change shader attributes based on points ...enjoy !!

https://vimeo.com/52551778

God Rays in Nuke

Here is a link to basic Tutorial on How to create 2d God Rays using a simple roto shape ...

http://satheeshnuketutorials.blogspot.in/2012/08/2d-volumetric-rays-in-nuke.html

Slope Based Shader And Basic Displacement in houdini.

Slope Based Shader :
                 Dot product of Y axis and surface Normal ..gives a value between 0-1, which is fed to a ramp(to control the slope).

I have used an example of ..two shader (surfaceModel1 and 2), where the latter is basically the inverse of the first one.That means areas not covered by the first shader ll be covered with the first one.

Basic Displacement Shader:

Basic Network for Displacement.

I was getting an artifact in my render with this.
Increasing Displacement Bound or Going to  object node, Render tab - > Dicing tab -> Ray Predicing change to Full Predicing, Fixed this.

http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=28934

Abt Me

Hi ..I am a cg enthusiast ..where i am planning to document , post links to the stuffs i learn...
Thankyou !!