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  • 8/12/2019 Theory on Shader (Unity)

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    Shader

    OVERVIEW

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    RENDER PIPELINE

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    WEBGL RENDER PIPELINE

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    Shader Pipeline

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    Shader Pipeline

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    Unity 3D Shader Structure

    Shader "MyShaderName" {

    Prpertie! {

    ### prpertie! here ###

    $

    Su%Shader {

    ### !u%!hader &r 'raphic! hard(are ) ###

    Pa!! {

    ### pa!! cmmand! ###

    $

    ### mre pa!!e! i& needed ###

    $

    Su%Shader { ### !u%!hader &r 'raphic! hard(are B ###

    $

    ### *ptinal &all%ac+ ###

    ,allBac+ "-erte.Lit"

    $

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    -ER/E0 E INDE0

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    -ER/E0 )ND INDE0

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    )//RIBU/ES1 UNI,*RMS )ND

    -)R2INGS

    Attributes are input 4aria%le! u!ed in the 4erte.!hader# ,r e.ample1 4erte. crdinate!1 4erte. clr!1

    and ! n# Due t the &act that the 4erte. !hader i!

    called n each 4erte.1 the attri%ute! (ill %e different

    e4ery time the 4erte. !hader i! in4+ed#

    Uniforms are input 4aria%le! a4aila%le &r %th the

    4erte. !hader and &ra'ment !hader# Unli+e attri%ute!1

    uniforms are constant during a rendering cycle# ,r

    e.ample1 li'ht! p!itin#

    Varyings are u!ed &rpassing data &rm the 4erte.

    !hader t the &ra'ment !hader#

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    -ER/E0 S5)DER

    /he 4erte. !hader i! called on each

    vertex# /hi! !hader manipulate!per-

    vertex data !uch a! vertex coordinates,

    normals, colors, and texturecoordinates# /hi! data i! repre!ented %y

    attri%ute! in!ide the 4erte. !hader# Each

    attri%utepoints to a VBO &rm (here itread! 4erte. data#

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    ,R)GMEN/ S5)DER

    E4ery !et & three 4ertice! de&ine! a trian'leand each element n the !ur&ace & that

    trian'le need! t %e a!!i'ned a clr#

    *ther(i!e ur !ur&ace! (uld %e tran!parent#

    Each !ur&ace element i! called a fragment#

    Since (e are dealin' (ith !ur&ace! that are

    'in' t %e di!played n yur !creen1 the!eelement! are mre cmmnly +n(n a!

    pixels#

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    ,R)GMEN/ S5)DER

    /he main 'al & the &ra'ment !hader i! tcalculate the clr & individual pixels#

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    ,*RW)RD RENDERING P)/5 6 UNI/2 3D

    ,r(ard Renderin' path render! each %7ect in ne r mre pa!!e!1dependin' n li'ht! that a&&ect the %7ect8

    Up t 9 pint li'ht! are calculated per:4erte.# /he ther li'ht! are

    cmputed a! Spherical 5armnic! ;S5unt

    ?uality Settin'1 then mre li'ht! are rendered per:pi.el1 in rder &

    decrea!in' %ri'htne!!#

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    Di&&u!e Re&lectin

    )l! called Lam%ertian re&lectin8 Li'ht i! re&lected int all directin! (ithut !pecular hi'hli'ht!8 In the ca!e & per&ect di&&u!e re&lectin1 the inten!ity & the %!er4ed

    re&lected li'ht depend! n the c!ine & the an'le %et(een the !ur&ace

    nrmal 4ectr and the ray & the incmin' li'ht#

    Where N L=


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