ano po ang ambient occlusion?

nakikita ko po lagi sa cgsociety yung term na ambient occlusion.. ano po gamit nun tska pano po gumawa sa max??? thanks in advance!

ralph_soriano wrote:nakikita ko po lagi sa cgsociety yung term na ambient occlusion.. ano po gamit nun tska pano po gumawa sa max??? thanks in advance!

sa vray they call it vraydirt!!! hehehe!!! wait natin ung mga masters na expert sa "AO". mas mapapakahulugan nila ng mabuti yun! hehehe!

see this sir
http://www.cgpinoy.org/visual-effects-tutorials-vfx-f100/lighting-using-ambient-occlussion-t3298.htm

read also here
http://www.cgpinoy.org/vray-f70/vray-occlusion-pass-t1122.htm

thanks po sir pixel burn n sir rendermaster.. malaking tulong po ito.. basa po muna ako! tanong po ulit ako mamaya after..

ito rin sir, may simple tutorial din jan si sir bokkins!!!

http://www.cgpinoy.org/vray-for-3d-studio-max-tutorials-f35/ambient-occlusion-with-vray-dirt-made-easy-t1739.htm

ayun! thanks sir mas malinaw po tong tutorial.. thanks sir pixelburn..
bale pang 3d stills po ang AO?? pano po kunwari animation? pwede rin po ba gamitin un?

read the link posted by rendermaster again. it can be used for animations of course. Most of the answers to questions posted here in the forums have been addressed already somehow - if we only take the time to search and read carefully.

sir v thanks po, follow up lng po bale pag stills po ung override na vray material wid vray dirt sa fiffuse, kaso pag di nako dadaan sa ps pwede rin po ung standard with diffuse na vray dirt? try ko po pagexperimentan muna tapos post ko po yung output dito para macheck nyo po! thanks!

I'm quoting my previous reply dun sa tut ni bokks:

Guest wrote:Boks way is fine except that you don't need RAM to spend energies in lighting the scene, or raytracing. It can be turned off - what you need is a plain B&W dirt pass.

In short:

Standard Material with vraydirt as diffuse, self -illuminated,
Lights, reflections, turned off in the globals.
Mulitplied in PS or AF


Another way to do it in a single pass:
Use vray dirt as a mask to combine regular + darker versions of your diffuse maps OR put your maps directly in the occluded/unoclluded slots of vraydirt.

Vray dirt is like salt 'n pepper - you put too much and it end up too salty and hot (vray dirt looking like molds or unnatural airbrushed shades)

Ibig sabihin pwede mo naman directly isama na sa render yung dirt liek I mentioned above. One more way is to check Detail Enhancement in the Vray:Irradiance map rollout. And in the recent versions, You can now compute and add AO via the Vray:Indirect Illumination (GI) parameters list.

ralph_soriano wrote:sir v thanks po, follow up lng po bale pag stills po ung override na vray material wid vray dirt sa fiffuse, kaso pag di nako dadaan sa ps pwede rin po ung standard with diffuse na vray dirt? try ko po pagexperimentan muna tapos post ko po yung output dito para macheck nyo po! thanks!

pwede bro. with that, magagamit mo sya sa animation. lagay mo lang sa diffuse. pwede mo pangblend sa existing material mo. good luck!

thanks sir bokks and sir v i think i got it.. i'll post the output here later but what i did was i created a vray material using a mask diffuse as sir v said.. then applied the properties i wanted such as some reflect and bump maps! thanks sir!

dirt map only


with diffuse

im not yet sure if what im doing is correct but please feel free to comment on my progress.. thanks cgp!

so how did you do it? Can only comment unless you tell me how you did it.

@ralph_soriano: i dont hindi gaano mahahalata ang ao pass mo d2 kasi bump map lng gamit mo try mo po i model talga yung cube dont use bump map.. as of now parang walang dirt pass dun sa 1st render mo.
for me ang ao or dirt pass is parang faster version lng ng details enhancement.. effective to pag maraming spaces or mga seam kasi lalo ma dedefine yung model mo,

hindi ko lng sure kung gumagana ang dirt pass sa bump map.. by the way sa rc3 built ng yung ao pass sa irradiance map roll out..

AO will work only on the crevices of your models - so you have to model them. It won't work on bumps.

ah gnun po ba yun?? cge po try ko ulit.. tanggalin ko ung bump.. thanks sir crayzard

@ sir v: yung vray mat po linagyan ko ng mask sa diffuse tapos matl map po sa diffuse tapos vraydirtmap sa mask.. tama po ba yun?

medyo nakayug ang utak ko sa paliwanag mo. pakipost ng capture ng mat comp mo.

Usually kung babasahin mo yung sinabi ko kanina - pwede mo nang ilagay diretso sa vraydirt ang map mo. Dun sa unoccluded slot and normal diffuse map. Sa occluded slot naman ang darkened version ng regular map o leave it flat black kung gusto mo.

Pwede rin naman na mask map - using dark and regular versions of the diffuse map na gusto mo, and vray dirt as a mask. Pareho din yun.

ayun sir kuha na po nagkamali po pala ako dapat pala vraymatl tapos vray dirt sa diffuse tapos yung material map sa unoccluded color lng ilalagay.. yung ginawa ko po kanina pati sa occluded kaya po ata nawala?? eto po yung output.. thanks po sa time sir v!


vray dirt map only


vray dirt with matl map in unoccluded color


vray dirt matl with reflect & bump

v_wrangler wrote:medyo nakayug ang utak ko sa paliwanag mo. pakipost ng capture ng mat comp mo.

Usually kung babasahin mo yung sinabi ko kanina - pwede mo nang ilagay diretso sa vraydirt ang map mo. Dun sa unoccluded slot and normal diffuse map. Sa occluded slot naman ang darkened version ng regular map o leave it flat black kung gusto mo.

Pwede rin naman na mask map - using dark and regular versions of the diffuse map na gusto mo, and vray dirt as a mask. Pareho din yun.

hehe sori sir v medyo nalito po ako kanina kaso ok na! thanks po ulit!

in Mental ray, you can assign an AO pass as either a material overide, or customizing it as seperate multiple materials. Does vray work the same way?

Hello AJ, how did the speech turned out?

Vray also has a material override in the Globals Control.

wow... nice discussion kahit nagkalitolito si sir v.... may napulot ako re: AO...
before ... what im doing is the one sir bokkins did... separate render and ayusin n lang s photoshop... ganito pala un pag one time rendering lang... heheh thanks guys!

Actually stryker - I would still suggest doing it in a separate pass for more control.

Isa pa, AO was meant to substitute for Global Illumination - while it doesn't have the secondary bounce of GI passes - sometimes pwede na ring makalusot.

Bokks, baka pwedeng i-attach itong thread dito:

http://www.cgpinoy.org/visual-effects-tutorials-vfx-f100/lighting-using-ambient-occlussion-t3298.htm

para di putol-putol ang information.

Thanks in advance.

sa vray ang ambient occlusion ay ang term na vray dirt ... kasi nga ...... nagbigigay siya ng natural na timpla ng mga depth ng shadow at.......... madami pa nasabi na ni vrtx wndler .....sayang

Hey V, Updated my post with the turnout. Overall it went very well!

CGP_master ever, love that avatar, lol...Sam Seed!