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本帖最后由 mylovetoyuo 于 2013-12-26 16:39 编辑
内容介绍：
The Gnomon Workshop - Forests Techniques Part Two
Grass and Plant Instancing in Maya & Mental Ray with Alex Alvarez
In this DVD, Alex covers how to create realistic grass using Maya, Paint Effects
and Mental Ray while also sharing his techniques for developing a complete natural
environment. We begin by evaluating the default Paint Effects grass library with
discussion on the basic adjustments needed to make grass more natural.
Techniques for covering large areas with grass are then explored via curves and
instancing. Through the use of instancing, particles and surface emitters,
Alex shows how to populate large scenes with grass geometry, rendering millions
of polygons with a minimal RAM footprint. Included is an expression based
technique for orienting instanced geometry with the normal of the generating
surface, an issue less important for plants or trees but often very important for grass.
When elements need to be interactively and precisely placed, Alex also
demonstrates the use of a freely available geometry paint script, as well as how
to bake particle instances to geometry. Generating textures, miaMaterials and
workflow in conjunction with Physical Sun/Sky is thoroughly discussed.
Alex also demonstrates how to render and utilize zDepth passes to add post
depth-of-field and fog effects, how to render true volumetric fog effects,
as well as Photoshop and After Effects post techniques to increase realism
through the use of color correction and plug-ins, including Magic Bullet,
LensCare and Sapphire.
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