Distribution вЂ“ The higher the distribution value, the tighter and compact the AO effect will look.Unoccluded Color вЂ“ This sets the base color or texture for the object, or the same input youвЂ™d use in the diffuse slot of your material.You can use a processed or darker version of the base texture here. Occluded Color вЂ“ AO shadows are usually black in color, but using this parameter you can choose any color or texture youвЂ™d like.Procedural textures like noise and cellular maps work quite well. Black areas get 0.0 radius, while white areas have a 1.0 radius value. You can precisely control where the AO is applied within the radius by using a black/white texture.В VRayDirt multiplies this texture with the radius value. Radius вЂ“ This distance sets the boundary for the AO effect from the corner.So letвЂ™s get going and look at the nuts and bolts of the VRayDirt map in 3ds Max. Also, darkening of corners provides clean follow lines for the viewer. Bring out tiny details in the scene earlier lost by too much bounced lighting.Add realistic grunge and dirt effects to corners and crevices, hence now named as VRayDirt.But actually, you can still use it to attain even greater realism combined with GI. Wherever objects are close to each other, they occlude (block) light, and all corners become darker.В This is just like calculating GI from the sky without any direct light.ДЄO can achieve this same look faster, by simply calculating where objects or facesВ intersectВ each other, and making these corners darker.ДЄO has dropped out of use nowadays because calculating GI has become fairly easy for modern day processors.

Imagine a completely cloudy day, and youвЂ™ll notice that light seems to be coming from all over the sky equally. To put it simply, AO can simulate an ambient global lighting without actually calculating too manyВ light paths. Back in the day, when calculating GI used to be highly CPU intensive, ambient occlusion was developed as its cheaper alternative. Ambient Occlusion, or AO for short, is an old rendering technique used as an approximation for true global illumination. Hey VRay users, today IвЂ™ll be discussing how you can use the Ambient Occlusion map VRayDirt to enhance your images.

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