Page 1 of 2 12 LastLast
Results 1 to 20 of 29
  1. #1
    Member vklidu's Avatar
    Join Date
    Aug 2006
    Location
    czech republic
    Posts
    788

    [Cycles] Section - Camera Limits vs. Material

    Question:
    Does it make a sense to have a possibility set a "Camera Limit" for visibility by another object?
    Does it make a sense proof Alt+B options?
    Or section by material is sufficient?


    Here are two examples of section techniques:

    1 - CAMERA LIMITS
    Blender can "section" objects by setting up camera "Limits".
    + That sounds like great option if you need section some complicated object (like engine, house ect.).
    + Camera Limits does section throw whole object in a scene.
    + And you can see result immediately in 3D window.
    - But from this side of sectioning view it is totally usable if it can be done from camera view only.
    - Also fact that "limits" cut whole scene is not always appreciated.
    - And the biggest problem - light behave is not affected.


    http://blender.howto.cz/blender-link...ion-Camera.jpg

    Note: In this time we have also "Clipping Border" Alt+B to see or hide part of object. It could solve minuses of "Camera Limits", but "Clipping Border" doesn't affect a render (also we can't animate it) in this time.

    2 - MATERIAL
    Section by Material (Transparent+Backfacing):
    http://blenderartists.org/forum/showthread.php?168570
    + You can section from any position.
    + And artifacts that were problem in 2.4x BI render looks OK in this Cycles render
    - You need to setup material to all parts manually


    http://blender.howto.cz/blender-link...n-Material.jpg

    BTW: Can Cycles control texture coordinates by another object like BI already?
    Last edited by vklidu; 13-Jan-12 at 15:02.



  2. #2
    Member bupla's Avatar
    Join Date
    Dec 2005
    Location
    France
    Posts
    476
    I love it. Could you share how you do the Section By Material with Cycles, because AFAIK, there's no ramp texture for the moment.



  3. #3
    Member vklidu's Avatar
    Join Date
    Aug 2006
    Location
    czech republic
    Posts
    788
    Go to this thread http://blenderartists.org/forum/show...er-Shade-Light
    There is a sample file. You will find an answer for one things around too.

    Section is done by Gradient texture - Linear.
    In texture panel I set size to 1000 to get sharp edge. Offset X axis = 0.001 let position in a middle of an object.

    Maybe there is some better way. I saw core of node for checker texture on a way somewhere. It could be easier.
    Also Volume Shader can bring correct volume of object. Instead of compositing.



  4. #4
    Member bupla's Avatar
    Join Date
    Dec 2005
    Location
    France
    Posts
    476
    Thanks for pointing me to this thread, the mapping of the Gradient texture is very clever. The downside is the settings of the mapping can't be animated.
    Last edited by bupla; 13-Jan-12 at 09:20.



  5. #5
    Member vklidu's Avatar
    Join Date
    Aug 2006
    Location
    czech republic
    Posts
    788
    Not for now, you are right, but as whole blender also Cycles will fully animated one day.
    But I hope in that time there is going to be option -control texture by another object

    Anyway in this time texture can't be animated, but values in Mapping Node can be.
    (I will post some anim test later.)

    Between experimental builds is also Checker texture already so sharp edge works great here (I'm just a bit confused with mapping).

    I want to try the Volume Shader Patch that can solve the faik limits.




    Last edited by vklidu; 13-Jan-12 at 15:09.



  6. #6
    Member michalis's Avatar
    Join Date
    Jul 2009
    Location
    Αθήνα
    Posts
    6,029
    An interesting thread. Bravo and a big thank you to all!



  7. #7
    Member vklidu's Avatar
    Join Date
    Aug 2006
    Location
    czech republic
    Posts
    788
    @michalis: thanks
    It looks I will have to fix the title of this thread zero comments to the topic -if the camera limits or clipping border (Alt+B) can be proofed to be something like Sketchups cross section tool.

    Anyway, Cycles with Volume patch for textured section is going to be also interesting topic

    Here is the anim test:
    Last edited by vklidu; 15-Jan-12 at 15:13.



  8. #8
    Member vklidu's Avatar
    Join Date
    Aug 2006
    Location
    czech republic
    Posts
    788
    first test of volume material
    (blender build with Volume patch downloaded from graphicall.org)

    Last edited by vklidu; 20-Jan-12 at 11:34.



  9. #9
    Member chip4brains's Avatar
    Join Date
    Feb 2008
    Location
    outer Chicago, IL
    Posts
    285
    Also adjust View clipping for this sort of thing - N key View Panel->Lens.
    i have seen the light... and i am FULL of it!

    keybds 4 sale... all keys work except F12.



  10. #10
    Member vklidu's Avatar
    Join Date
    Aug 2006
    Location
    czech republic
    Posts
    788
    @chip4brains: thanks for note, but this option has all minuses of camera limits + 3Dview is not rendered

    Here is some animation of volumetric crossection


    Do you know how to get black&white sharp edge (for section factor)?
    I used Texture>Mapping>Scale>X=1000.
    I can't find something like "Constatnt" option for gradient that internal has.
    Last edited by vklidu; 20-Jan-12 at 11:36.



  11. #11
    Member
    Join Date
    Feb 2010
    Location
    England
    Posts
    511
    @vklidu
    In your video there seems to be faded area on the ground plane that corresponds to the postion of cube when it shows the sectioning
    Every time I see a model that someone as worked hard on, i am inspired to try harder.



  12. #12
    Member vklidu's Avatar
    Join Date
    Aug 2006
    Location
    czech republic
    Posts
    788
    I had the same question:
    http://blenderartists.org/forum/show...=1#post2025213

    but I don't know how or why . . .



  13. #13
    Nice, I was looking for something like this. Need to check the volumetric patch.

    For the sharp banding, use a "math" node with "greater than" 0.5. in between the "wave texture" and the "mix" shader
    Happiness is just a temporary chemical
    ambivalence of the true state of mind.



  14. #14
    Member AlexDS's Avatar
    Join Date
    Aug 2010
    Location
    Romania
    Posts
    389
    Originally Posted by vklidu View Post
    Question:
    Does it make a sense to have a possibility set a "Camera Limit" for visibility by another object?
    Does it make a sense proof Alt+B options?
    Or section by material is sufficient?
    yes, it does!
    my portfolio / my blog
    my system: Win 7; intel i5 750, 6 GB DDRAM3 , Geforce GTS 250



  15. #15
    Member vklidu's Avatar
    Join Date
    Aug 2006
    Location
    czech republic
    Posts
    788
    Sorry for late answer (a bit a busy life )

    Originally Posted by cnikiel View Post
    For the sharp banding, use a "math" node with "greater than" 0.5. in between the "wave texture" and the "mix" shader
    @cnikiel: thanks man!!! that is what I was looking for



    @AlexDS: welcome to the club
    Last edited by vklidu; 21-Jan-12 at 03:30.



  16. #16
    Member vklidu's Avatar
    Join Date
    Aug 2006
    Location
    czech republic
    Posts
    788
    I'm impressed as sharp and heavy volume can be set via Cycles
    (The mesh is still cube )



    Last edited by vklidu; 21-Jan-12 at 03:55.



  17. #17
    Originally Posted by vklidu View Post
    Re: [Cycles] Section - Camera Limits vs. Material
    Question:
    Does it make a sense to have a possibility set a "Camera Limit" for visibility by another object?
    Does it make a sense proof Alt+B options?
    Or section by material is sufficient?
    Yes to all three! but you need to add a subsurf modifier to view this but the "Apply Modifier To Editing Cage" isnt open to Python, AFAIK, so you can't set a hotkey for it.
    You can set up the other display options in the subsurf via hot keys though, so maybe that will be enough?
    Nice work by the way!



  18. #18
    I set up a material to be controlled by an empty. Makes it much easier to control how the limit is controlled.
    Attached Files Attached Files



  19. #19
    Member NinthJake's Avatar
    Join Date
    May 2009
    Location
    Sweden
    Posts
    1,831
    Again you are doing wonders with the volume patch vklidu, I don't know how many more times I need to have my jaw fixed before you stop amazing me



  20. #20
    Seconded that, very eye catching rendering. Sadly i still can not run it on AMD GPU, it will compensate a bit overall slowness.



Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •