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موضوع: Rendering with mentalray ....

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  1. #1
    مشرف منبر Maya
    صور رمزية hmsabry
    تاريخ التسجيل
    Jul 2007
    المنطقة
    Egypt
    العمر
    35
    ردود
    1,376

    Rendering with mentalray ....

    hi friend
    i would like to make this thread for rendering
    and its technics


    first of all you musttttt read this thread
    Vray-like with mentalray


    this was may first test after i read that thread




    it need alot of work in texturing and alot of tweaking in
    rendering


    the model from archinteriors

    so lets do good rendering stuff and lets share the knowledge
    with each other


    there is alot of subject we need to study
    so if anybody understand it lets share it
    with each other.
    and if no one know itt ...!! soo lets search for it
    and help each other

    lets goooo
    Hazem M. Sabry
    VFX Artist
    MBC Creative Service
    ===========
    www.hmsabryworks.com
    Voxel Works - My Tutorials Page


  2. #2
    مشرف منبر Maya
    صور رمزية hmsabry
    تاريخ التسجيل
    Jul 2007
    المنطقة
    Egypt
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    i've explain it before but i copy it here
    to the render thread

    Anti-Aliasing




    *i made the square noisy to see the pixels


    your image contains alot of pixels, this pixel carries the RGB color.
    look closely to the edge of the square... you will see it sharp
    because of the square's edges go strait with pixels

    but when you draw a line which is not strait
    the line will pixellate like this...


    *with zoom

    so if we need the edge go sharp so we need to add more pixels
    to decrease this pixelation




    3D World
    in 3d we have the anti-aliasing
    this is the process which we decide for how much pixels will be added.

    we have 2 deferent ways in AA (Anti-Aliasing)
    * Fixed samples
    * Adaptive samples

    Fixed samples.... you are tilling maya that i want you to raise the pixels
    in all over the image whether there is a curve needs pixels or there is not...!! (Solid color)
    and thats toooooooooooo much money

    But Adaptive samples.... you are tilling maya that i want you to raise the
    pixels at the places that needs more pixels... (at curves)




    as shown above the pixelated edge for the low samples

    with adaptive samples you determine the min. and the max. values for
    the samples ..(min=at least add pixels with this rate, max=add pixles
    but dont go high than this rate)


    *the black grid this is the pixels

    there is an Under Sampling and Over Sampling

    over sampling means that the pixel subdivide.
    0= 1 subdivision inside the pixel one time
    1= 2 subdivision ....
    and so on...

    and under sampling that means combines more one
    pixel in one sample ...
    -1= combine 4 pixels
    -2= combine 8 pixels
    and so on....

    so there must be a minimum and maximum value for sampling
    like -2,0 -1,1 0,2 ... and so on......

    Hazem M. Sabry
    VFX Artist
    MBC Creative Service
    ===========
    www.hmsabryworks.com
    Voxel Works - My Tutorials Page

  3. #3
    مشرف منبر Maya
    صور رمزية hmsabry
    تاريخ التسجيل
    Jul 2007
    المنطقة
    Egypt
    العمر
    35
    ردود
    1,376


    so the adaptive sampling we add more pixels
    at places that needs more pixels... and the places that doesnt
    need more pixels we never add pixels,

    so...
    there is very important thing in maya and there is very very few
    people that use it ... samples Diagnose

    samples diagnose show you the way that the samples spread in
    the image


    *to activate the sample diagnose ... go to render global > Diagnostic > (chick samples)...


    as you can see...
    in samples -2,0 the samples (white dots) has been spread in a wide range
    and by raising the sample bit by bit the samples is pushed into the edges
    and if you see the render you will find the edge go sharp because the
    edges has more more pixels to smooth
    but in -2,0 the samples has been wasted in the image so the edge is
    pixelated....

    ok



    Hazem M. Sabry
    VFX Artist
    MBC Creative Service
    ===========
    www.hmsabryworks.com
    Voxel Works - My Tutorials Page

  4. #4
    عضو فعال
    صور رمزية GPA_Man
    تاريخ التسجيل
    Dec 2006
    المنطقة
    Egypt
    ردود
    197
    yeah , hazem your link is soo powerful

    , and here is another link
    http://www.mymentalray.com/mymr_tutorials/tutorials.htm

  5. #5
    عضو فعال
    صور رمزية GPA_Man
    تاريخ التسجيل
    Dec 2006
    المنطقة
    Egypt
    ردود
    197
    ok guys we moved test from the compositing workshop to here

    here is the link again
    http://www.treddi.com/forum/index.ph...opic=8436&st=0

    so let's start and make it great place to share knowledge

  6. #6

  7. #7
    عضو فعال
    صور رمزية GPA_Man
    تاريخ التسجيل
    Dec 2006
    المنطقة
    Egypt
    ردود
    197
    another test , it's


    http://img84.imageshack.us/img84/207...ntest03ri6.jpg

    i just rise up the filter from 1 to 2

  8. #8
    مشرف منبر Maya
    صور رمزية hmsabry
    تاريخ التسجيل
    Jul 2007
    المنطقة
    Egypt
    العمر
    35
    ردود
    1,376
    what about the Radius of the Fg
    min. and the max.


    still you have a splotches in the top corner
    you need to reestimate the radius to avoid the
    splotshes...

    and try to raise the fg rays
    Hazem M. Sabry
    VFX Artist
    MBC Creative Service
    ===========
    www.hmsabryworks.com
    Voxel Works - My Tutorials Page

  9. #9
    عضو فعال
    صور رمزية GPA_Man
    تاريخ التسجيل
    Dec 2006
    المنطقة
    Egypt
    ردود
    197
    here is a another one i fix the shadow , i do that by rise up the shadow rays

    http://img508.imageshack.us/img508/1...ntest04jd6.jpg

  10. #10
    مشرف منبر Maya
    صور رمزية hmsabry
    تاريخ التسجيل
    Jul 2007
    المنطقة
    Egypt
    العمر
    35
    ردود
    1,376
    very good ya hany
    Hazem M. Sabry
    VFX Artist
    MBC Creative Service
    ===========
    www.hmsabryworks.com
    Voxel Works - My Tutorials Page

  11. #11
    عضو فعال
    صور رمزية GPA_Man
    تاريخ التسجيل
    Dec 2006
    المنطقة
    Egypt
    ردود
    197
    hazem please can you show us how we can use diagnostic with final gathering
    , and how it can help us to setup Min\Max radius to get the most accurate result

  12. #12
    كان عندي سوال اذا كان في الموقع او موقع اخر تعليم المنتل ري باحتراف اذا كان متوفر هل بالامكان ان تدلونا عليها وجزاك الله خير
    Do Not Give Up
    You are going to make it!
    YOu are going to make it!

    Do not, I repeat do not give up,
    now that you stand on the brink of a breakthrough!

    Be very careful; Make sure of every step you take.
    This day is made just for you!
    You are going to make it today!

  13. #13
    عضو فعال
    تاريخ التسجيل
    Sep 2006
    المنطقة
    Riyadh_Syria
    ردود
    207
    Thanks alot

  14. #14
    مشرف منبر Maya
    صور رمزية hmsabry
    تاريخ التسجيل
    Jul 2007
    المنطقة
    Egypt
    العمر
    35
    ردود
    1,376
    اقتباس الموضوع الأصلي كتب بواسطة ALqursan2 معاينة الرد
    كان عندي سوال اذا كان في الموقع او موقع اخر تعليم المنتل ري باحتراف اذا كان متوفر هل بالامكان ان تدلونا عليها وجزاك الله خير
    as hany said mymentalray
    and see the link that i send (vray-like)
    Hazem M. Sabry
    VFX Artist
    MBC Creative Service
    ===========
    www.hmsabryworks.com
    Voxel Works - My Tutorials Page

  15. #15
    مشرف منبر Maya
    صور رمزية hmsabry
    تاريخ التسجيل
    Jul 2007
    المنطقة
    Egypt
    العمر
    35
    ردود
    1,376
    i recommend that you see the digital tutors mentalray
    cds

    its very good ... have a look
    Hazem M. Sabry
    VFX Artist
    MBC Creative Service
    ===========
    www.hmsabryworks.com
    Voxel Works - My Tutorials Page

  16. #16
    عضو فعال
    تاريخ التسجيل
    Sep 2006
    المنطقة
    Riyadh_Syria
    ردود
    207
    hmsabry please , what's mean DAG nodes

  17. #17
    مشرف منبر Maya
    صور رمزية hmsabry
    تاريخ التسجيل
    Jul 2007
    المنطقة
    Egypt
    العمر
    35
    ردود
    1,376
    اقتباس الموضوع الأصلي كتب بواسطة GPA_Man معاينة الرد
    hazem please can you show us how we can use diagnostic with final gathering
    , and how it can help us to setup Min\Max radius to get the most accurate result



    in tips and trix for FG you can see it
    http://www.zshare.net/download/43233656b33cbc/
    Hazem M. Sabry
    VFX Artist
    MBC Creative Service
    ===========
    www.hmsabryworks.com
    Voxel Works - My Tutorials Page

  18. #18
    مشرف منبر Maya
    صور رمزية hmsabry
    تاريخ التسجيل
    Jul 2007
    المنطقة
    Egypt
    العمر
    35
    ردود
    1,376
    اقتباس الموضوع الأصلي كتب بواسطة aloshM معاينة الرد
    hmsabry please , what's mean DAG nodes
    open maya help you will find a good definition
    for it.
    Hazem M. Sabry
    VFX Artist
    MBC Creative Service
    ===========
    www.hmsabryworks.com
    Voxel Works - My Tutorials Page

  19. #19
    عضو فعال
    تاريخ التسجيل
    Sep 2006
    المنطقة
    Riyadh_Syria
    ردود
    207
    GPA_Man

    this step of tutorial not clear for me ??

    b. “Diffuse” light
    Create a point light and open the light’s attributes. Under the mental ray section turn on the “Area Light” option.

    it's mean

    point light converted into a mentalray area light


    but i could't do this step

  20. #20
    مشرف منبر Maya
    صور رمزية hmsabry
    تاريخ التسجيل
    Jul 2007
    المنطقة
    Egypt
    العمر
    35
    ردود
    1,376
    اقتباس الموضوع الأصلي كتب بواسطة aloshM معاينة الرد
    GPA_Man

    this step of tutorial not clear for me ??

    b. “Diffuse” light
    Create a point light and open the light’s attributes. Under the mental ray section turn on the “Area Light” option.

    in the past ... when you need a light to fill
    a space (softly) , you should make a point light and
    in mentalray tab in the light you check
    on the use area light
    coz with the area light the image was too heavy to render


    but now you are just make an area light and
    make it (mentalray area light) by checking
    the use area light
    its fast in render than before
    Hazem M. Sabry
    VFX Artist
    MBC Creative Service
    ===========
    www.hmsabryworks.com
    Voxel Works - My Tutorials Page

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