充3
1. Vray4
2.Iradiance map .12
充..16
.17
- 3ds max VRay . , VRay , - mental ray, finalRender brasil r/s . , .
. -, VRay - -. , , VRay -. , VRay , . VRay .
VRay
VRay: QMC Sampler
, VRay -, QMC sampler :
, -. , , VRay - , , translucency, caustic . ., . , , , , , , - / .
Lock to pixels . chekbox , , . - , . , . Lock to pixels - (flickering) , VRay.
Adaptation by effect on final result (importance sampling) - , . - () ( - ). , , - , . importance sampling . , . - . , importance sampling VRay ( - ) . Amount , importance sampling . Amount importance sampling, Amount = 1 . importance sampling - . importance sampling - , , . , Amount . - Amount, , . Amount=1.
|
|
Adaptation by sample values (early termination) - VRay , . , , . , . Amount - Amount=0 , Amount=1 early termination , , . , Amount=0, . importance sampling, Amount - 0.85.
Min. samples - . , .
Noise threshold - , , , . . Noise threshold, , , . , () . "", - .
|
|
VRay . Amount importance sampling early termination , , VRay . , subdivs, GI . Amount importance sampling early termination , ( - ) , , , Min. Samples. , , .
.1 Amount = 0, Noise threshold=0.005.
.2 Amount =1, Noise threshold=0.005. , 2.5 .
.3 Amount =1, Noise threshold=0.1. Noise threshold , ( , "" ).
VRay Amount Noise threshold , - . , . 0 Noise threshold - VRay , , , - .
QMC - - , VRay, "" - early termination importance sampling. , " " , -.
GI (Global Illumination)
- , VRay , . , GI ( checkbox "On" VRay: Indirect Illumination). , . (, , .).
.4 . . - .
, Exclude . " " . , , , Generate diffuse, - . . / , Receive GI Generate GI ( VRay: System>Object settings).
VRay , . ray tracing VRay: Global Switches VRay: Image Sampler (Antialiasing), VRayMtl.
|
|
- VRay . GI VRay: Indirect Illumination, - VRay. - . GI check box "On" VRay: Indirect Illumination.
- caustic- , VRay: Caustic VRay: System (Object settings Light settings).
, VRay , , . (GI).
GI.
Indirect Illumination VRay :
Direct computation;
Irradiance map;
(Global photon map).
, - ( , , ) (, ). - ( ), . :
Direct computation direct computation (direct+direct) photon map (direct +photon) ;
Irradiance map direct computation (irr_map+direct) photon map (irr_map+photon).
.5 , .
Direct computation (DC) -. - brute force, " ". direct+direct ( Subdivs First diffuse bounces>Direct computation) , - BRDF. BRDF , () . . ( ) - ( ), subdivs Secondary bounces>direct computation, Depth - . , , Depth, QMC Sampler - importance sampling early termination.
|
|
" " ( ) . . , - . , Subdivs 50 , 2500 , 2500 , 2500 , 2500 , QMC. , DC . VRay , . , DC - , , . - (Subdivs), . , direct+direct computation - reference-, , ( ).
direct +photon, , , ( Search distance ). , .
- () DC, . , "" , , !? , , VRay .[1]
Irradiance map
irradiance map direct computation , , . ( ) , Interp. Samples First bounces>Irradiance map. , - , .
irradiance map , . Min. rate, - Max. rate First diffuse bounces>Irradiance Map, . -2 , - . irradiance map , , . , Min. Rate = -3, Max. Rate = 0, irradiance map : (-3, -2, -1, 0). , . -3 . , , , .
() Clr. thresh, - Nrm. thresh, - Dist. thresh. , , . , , - irradiance map. - , irradiance map . , irradiance map, . - . , Clr. thresh, - .
|
|
, irradiance map , irradiance map, . , direct computation, . , irradiance map+photon map - irradiance map, photon map, " " .
Min. rate Max. rate - . , Min. rate = -3 Max. rate = 0 800x600 , 1200x1024 Min. rate = -4 Max. rate = -1, . , - .
direct computation - , , , direct computation - , - . - :). irradiance map first diffuse bounce - , ( - , ) , secondary bounces. VRay. , . irradiance map, /, . , irradiance map , secondary bounces . . irradiance map secondary bounces . . first diffuse bounce irradiance map , secondary bounces - , . irradiance map . GI VRay - irradiance map . irradiance map , , .
irradiance map direct computation . , . - VRay, . , GI irradiance map + photon map VRay GI mental ray final gathering. , final gathering, irradiance map, . , irradiance map , final gathering , - .
, direct+direct , direct+photon map irradiance map + direct , irradiance map + photon map - , , , . , . . - . ( ), . - . , . - Skylight. , "" .
- irradiance .[2]
. . , .
, - , , . , . , (, , , Ward ) , , . - , . . , .
( ) . - ray tracing method. , , - , . , , . - , , . , distribution ray tracing (DRT). DRT , , , . . ( fuzzy, blurry glossy ), . DRT VRay Glossy.