Osnove 3D modeliranjaIzbirni predmet

Helena Gabrijeli Tomc

TEKSTILSTVAUNI: Nartovanje tekstilij in oblailVS: Proizvodnja tekstilij in oblail

GRAFIKEUNI: Grafine in interaktivne komunikacijeVS: Grafina in medijska tehnika

Univerzitetni in visokoolski tudijski programi

Shane Acker: 9 (2009)https://www.youtube.com/watch?v=yH9csuhqrno

https://www.youtube.com/watch?v=yH9csuhqrno

Svetloba in materija

Svetloba kot delec in valovanje

refleksija (reflection)

difuzija (diffusion)

lom (refraction)

transmisija (transmision)

sipanje (scattering)

absorbcija (absorption)

disperzija (dispersion)

kavstika (caustics)

difrakcija (diffraction)

interferenca (interference)

polarizacija (polarization)

http://jironomo.com/architectural-visualisation-blog/2010/04/how-much-does-a-3d-rendering-cost/

Interakcija svetlobe z materijo

http://jironomo.com/architectural-visualisation-blog/2010/04/how-much-does-a-3d-rendering-cost/

Fresnelova enaba (Snellerjev zakon)

Refleksija

http://en.wikipedia.org/wiki/Fresnel_equations

http://www.pbrt.org/gallery/metal_spheres.pnghttp://en.wikipedia.org/wiki/Fresnel_equations

Difuzija

Reflektivnost / Difuznost

https://www.sabic-ip.com/staticcxp/user/en/LearnAboutColor/ColorBasicsDetail/reflectance_curves.html

Barva

https://www.sabic-ip.com/staticcxp/user/en/LearnAboutColor/ColorBasicsDetail/reflectance_curves.html

Spekularnost

kovinski

blee nekovinski

nekovine: bela spekularna svetloba kovine: spekularna svetloba barve kovine

Odsevnost

triki z okolico in osvetljevanjem povrinsko veliki svetlobni viri

mat, reflektivne anizotropina refleksija, barvno-povrinski kontrasti, zelo temne sence triki z lumi in okolico

Kovine

Primer: Jaka Dovjak

I0

n

n2

Snellerjev zakon

Lom

Fresnelova enaba Snellerjev zakon problem zrcalne transmisije

Transmisija

I0

Is

Sipanje

Absorpcija

http://www.youtube.com/watch?v=gYWpjrkPT5Q

Disperzija

http://www.youtube.com/watch?v=gYWpjrkPT5Qhttp://www.youtube.com/watch?v=gYWpjrkPT5Q

http://www.youtube.com/watch?v=WiuNj6lLvxE

Kavstika

http://www.youtube.com/watch?v=WiuNj6lLvxEhttp://www.youtube.com/watch?v=WiuNj6lLvxE

teksturaalgoritmi za

senenjemape,

mapiranjelui,

senceupodabljanje

specifine nastavitve

topologija modela

Simulacija materialov in njihove interakcije s svetlobo

Algoritmi senenja

HSR

Z-depth

Senenje

http://portfolio.ego-farms.com/

difuzni materiali (flat, Lambert, Oren-Nayar)

reflektivni materiali(Phong, Gouraud)

specifini materiali (metal, transparent, anisotropic...)

Senenje

http://media2.twopointostage.com/view/cook-torrance-shader

povrina objekta opazovalec refleksija svetlobe http://www.cs.princeton.edu/courses/archive/fall06/cos526/tmp/wynn.pdf

Io= Ir+Ia+It

BRDF (Bidirectional Reflectance Distribution Function)

http://media2.twopointostage.com/view/cook-torrance-shaderhttp://www.cs.princeton.edu/courses/archive/fall06/cos526/tmp/wynn.pdf

BRDF (Bidirectional Reflectance Distribution Function)

https://www.youtube.com/watch?v=4QXE52mswIE

https://www.youtube.com/watch?v=4QXE52mswIE

GLASSdiffuse:0%(black)reflection:4-5%\100(fresnel - towards-away)refraction: 1.5-1.8, depends from typetransparency 100%

WATERdiffuse:0%(black)reflection:4-5%\100refraction: 1.33(the majority of transparent liquids)transparency 100%

OCEAN(surface)diffuse:0%(black)reflection:4-5%\100refraction: 1.33transparency 0%

PLASTICSdiffuse:20-80%reflection:4-5%\100 refraction: 1.46-1.55(Plastic 1.46 - 1.55Plexiglas 1.48)

BRDF za razline materiale

Algoritmi za senenje difuznih povrin

http://wiki.blender.org/index.php/Doc:2.4/Manual/Materials/Properties/Diffuse_Shaders

http://wiki.blender.org/index.php/Doc:2.4/Manual/Materials/Properties/Diffuse_Shaders

normala poligona svetlobni vir preraun kota svetlobe seni poligon idelane difuzne povrine (kreda, prah, tekstil)

Plosko senenje, Lambertov algoritem

difuzne, grobe povrinebeton, koa, pesek

http://en.wikipedia.org/wiki/Oren%E2%80%93Nayar_reflectance_model

Oren-Nayarov algoritem

http://en.wikipedia.org/wiki/Oren%E2%80%93Nayar_reflectance_model

Fresnel

http://wiki.blender.org/index.php/Doc:2.4/Manual/Materials/Properties/Diffuse_Shaders

difuzna reflektirana svetloba odvisna od kota vpadle svetlobe

http://wiki.blender.org/index.php/Doc:2.4/Manual/Materials/Properties/Diffuse_Shaders

Primer: Miha Horvat

http://wiki.blender.org/index.php/Doc:2.4/Manual/Materials/Properties/Diffuse_Shaders

Algoritmi za senenje spekularnih povrin

http://wiki.blender.org/index.php/Doc:2.4/Manual/Materials/Properties/Diffuse_Shaders

https://www.youtube.com/watch?v=PMgjVJogIbc

Smooth shading

https://www.youtube.com/watch?v=PMgjVJogIbc

intenzivno interpolacijsko senenje, gladke mat povrine povpreenje normal vseh povrin stika na doloenem verteksu barvni gradienti po poligonu problem ostrih robov problem zrcalnih odbojev (spekularnih)

Gouraudov algoritem (Henri Gouraud)

spekularni odboji senenje z interpolacijo vektorjev normale med verteksi kot svetlobe za vsak piksel posebej reflektivne (svetlee) povrine, dobri zrcalni odboji e vidni robovi poligonov

Phong algoritem (Bui Tuong Phong)

http://wiki.blender.org/index.php/Doc:2.4/Manual/Materials/Properties/Specular_Shaders

modifikacija Phongovega algoritma: Jim Blinn (za spekulatne odboje) mehkeji zrcalni odboji odpravi nekatere pomankljivosti Phong. algor. (kot gledanja pod 90)

Blinn (Blinn-Phong) senenje

http://wiki.blender.org/index.php/Doc:2.4/Manual/Materials/Properties/Specular_Shaders

kovine, sijoa plastika

Cook-Torrance

anizotropino senenje (polirane kovine, lasje) senenje kovin transkulentni materiali algoritmi za nerealistino senenje

http://www.3dmax-

tutorials.com/Choosing_Colors_for_Realism.html

http://www.kxcad.net/autodesk/3ds_max/Autodesk_3ds

_Max_9_Reference/understanding_shaders.html

http://www.kxcad.net/autodesk/3ds_max/Autodesk_3

ds_Max_9_Reference/anisotropic_shader.html

Specifini algoritmi

http://www.3dmax-tutorials.com/Choosing_Colors_for_Realism.htmlhttp://www.kxcad.net/autodesk/3ds_max/Autodesk_3ds_Max_9_Reference/understanding_shaders.htmlhttp://www.kxcad.net/autodesk/3ds_max/Autodesk_3ds_Max_9_Reference/anisotropic_shader.html

Anizotropino senenje

http://www.3drender.com/glossary/anisotropic.htm

http://www.youtube.com/watch?v=t4MTnpnahu0#t=190

http://www.3drender.com/glossary/anisotropic.htmhttp://www.youtube.com/watch?v=t4MTnpnahu0

Algoritmi za senenje nefotorealistinih upodobitev (Toon)

http://wiki.blender.org/index.php/Doc:2.4/Manual/Materi

als/Properties/Diffuse_Shaders

http://wiki.blender.org/index.php/Doc:2.4/Manual/Materials/Properties/Diffuse_Shaders

Algoritmi za senenje nefotorealistinih upodobitev (Toon)

http://jikz.net/archives/441

http://jikz.net/archives/441

Primer: Barbara Centa

http://www.pxleyes.com/blog/2010/05/introduction-to-3ds-max-materials/

Algoritmi senenja: 3ds Max

http://www.pxleyes.com/blog/2010/05/introduction-to-3ds-max-materials/

Fraktali

Fractal Explosion.mp4

Fraktali v naravi

"fractus" 1967: How Long Is the Coast of Britain? Statistical Self-Similarity and Fractional Dimension teorija kaosa (vzrok-posledica, obutljivst na zaetne pogoje)

Mandelbrotov fraktal definicija fraktala

iniciator

generator

nelinearnost samopodobnost, rekurzivnost neskonna kompleksnost

motnja

iteracije

Kochova sneinka

Cantorjev nabor

Fraktal plusov

fraktalni oblak nakljuno premeanje sredinske toke

Plazma

Opisovanje narave s fraktali

Primer: Jeni, Isengard

http://www.xfrog.com/Xfrog

ChaosProhttp://www.chaospro.de/

Bryce http://www.daz3d.com/bryce-7-pro

http://www.xfrog.com/http://www.chaospro.de/