![[Default displacement interface]](vray_for_3ds_max_manual/default_displacement/default-displacement.png)
Override
Max's - when this option is on, V-Ray will
render objects with displacement materials using its own internal
microtriangle displacement. When this option is off,
the objects will be rendered with the standard 3ds Max displacement.
Edge length - this determines the quality
of the displacement. Each triangle of the original mesh is subdivided into a
number of subtriangles. More subtriangles mean more detail in the
displacement, slower rendering times and more RAM usage. Less subtriangles
mean less detail, faster rendering and less RAM. The meaning of
Edge length depends on the View-dependent
parameter below.
View-dependent - when this is on,
Edge length determines the maximum length of
a subtriangle edge, in pixels. A value of 1.0 means that the longest edge of
each subtriangle will be about one pixel long when projected on the screen.
When View-dependent is off, Edge length is the maximum subtriangle edge
length in world units.
Max. subdivs - this controls the maximum
subtriangles generated from any triangle of the original mesh. The value is
in fact the square root of the maximum number of subtriangles. For example,
a value of 256 means that at most
256 x 256 =
65536 subtriangles will be generated for any
given original triangle. It is not a good idea to keep this value very high.
If you need to use higher values, it will be better to tesselate the
original mesh itself into smaller triangles instead. From build 1.45.20
onward, the actual subdivisions for a triangle are rounded up to the nearest
power of two (this makes it easier to avoid gaps because of different
tesselation on neighboring triangles).
Tight bounds - when this is on, V-Ray will
try to compute the exact bounding volume of the displaced triangles from the
original mesh. This requires pre-sampling of the displacement texture, but
the rendering will be faster, if the texture has large black or white areas.
However, if the displacement texture is slow to evaluate and varies a lot
between full black and white, if may be faster to turn this option off. When
it is off, V-Ray will assume worst-case bounding volumes, and will not
presample the texture.
Amount - this is a scaling parameter for
the default displacement. Values larger than 1.0
increase the displacement amount, while values lower than
1.0 reduce it.
Relative to bbox - if this parameter is
on, the actual displacement amount is based on
the bounding box of the objects, like this is done by 3ds Max itself by
default. If this option is off, the displacement
is expressed in generic world units where white areas in the displacement
map correspond to displacement of 1 generic unit. You can use the
Amount parameter to increase or decrease
displacement amount.
