3D Creative December 2015

3DCREATIVE MAGAZINE | Mastering displacement details
Fabric textures used in
the cloth shaders
Texturing the clothes: The secret to
08 making good cloth shaders, for me,
is to choose a nice fabric texture as a base to
create the bump and diffuse maps. I rarely add
reflections to cloth, only if it’s really visible in
the type of fabric I want to mimic. I usually run
away from very flat and realistic cloth – I really
try to give a quick and exaggerated look to the
fabric, and also try to make the stitch texture not
too tiled. I use many images to make the dirt in
the clothes, but also some texture brushes in
Photoshop with scatter and hue variations. For all
the pockets and leather materials I use a similar
workflow, but with a blurry reflection using the
unsaturated texture as specular map.
Texturing the spray tank models: I’ve
09 developed a very quick shader workflow
for scratched and worn-out metal. I know that
I have to replicate the same shader with little
differences through all the metallic objects, but if
I had to paint all the diffuse, specular and bump
textures for each one separately, it would take
a lot of time. So I create a blend of two shaders:
painted metal and rusted metal. For each slot, I
create a composite shader with a base color using
VRayColor, then tile metal textures with different
opacity values on top of it. I use a normal map
of random noise surface over the metal bump
to make it look more irregular. To blend the two
materials, I paint masks in Photoshop for each
object, and then, if I want to apply the same
shader to another object, I just change the mask
and it works fine.
Basic shader setup: These are some
10 examples of how I set up some of my
shaders mentioned before. The red one is my skin
material; it’s basically a VRayBlendMtl composed
of an SSS2 shader for the skin itself and a VRayMtl
with black diffuse in additive mode for realistic
reflections. I always use the GGX BRDF option
in all of the shaders – this new V-Ray feature
makes the specular more accurate and detailed.
The blue material is the basic metal shader I
use for all metallic objects. The last one is the
Metal shader workflow of the spray tank
Setup of the main shaders I used
cloth shader with a falloff shader applied in the
diffuse slot. I use the falloff between the texture
and a brighter version of the same in order to
mimic the roughness of the surface caused by the
microfibers in the cloth, usually not present in
leather shaders.
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