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Subject: VRayIES parameters
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      <H1>VRayIES light parameters</H1></TD>
    <TD width=3D0%>
      <DIV align=3Dcenter><A=20
      =
href=3D"http://www.spot3d.com/vray/help/150SP1/index.htm">Home</A></DIV><=
/TD>
    <TD width=3D0%>
      <DIV align=3Dcenter>Examples</DIV></TD></TR></TBODY></TABLE>
<P>&nbsp;</P>
<BLOCKQUOTE>
  <P><A=20
  =
href=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/vrayies/vr=
ayies.png"><IMG=20
  border=3D1=20
  =
src=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/vrayies/tn_=
vrayies.png"=20
  width=3D200 height=3D200></A> </P>
  <P> </P><A=20
  =
href=3D"http://www.spot3d.com/vray/help/150SP1/vrayieslight_params.htm#ge=
neral">General</A><BR><A=20
  =
href=3D"http://www.spot3d.com/vray/help/150SP1/vrayieslight_params.htm#pa=
rameters">Parameters</A><BR>
  <P><A=20
  =
href=3D"http://www.spot3d.com/vray/help/150SP1/vrayieslight_params.htm#no=
tes">Notes</A></P></BLOCKQUOTE>
<H2><A name=3Dgeneral></A>General</H2>
<BLOCKQUOTE>
  <P>The <SPAN class=3Dvalue>VRayIES</SPAN> is a V-Ray specific light =
source=20
  plugin that can be used to load and render real-world light =
distribution=20
  profile files (IES files). The <SPAN class=3Dvalue>VRayIES</SPAN> =
light is very=20
  similar to the 3ds Max <SPAN class=3Dvalue>Photometric</SPAN> lights, =
but is=20
  specifically optimized for the V-Ray renderer and typically renders=20
faster.</P></BLOCKQUOTE>
<H2><A name=3Dparameters></A>Parameters</H2>
<BLOCKQUOTE>
  <P><IMG border=3D1 hspace=3D10 alt=3D"[VRayLight parameters]" =
vspace=3D10 align=3Dright=20
  =
src=3D"http://www.spot3d.com/vray/help/150SP1/images/controls/ieslight.pn=
g"=20
  width=3D176 height=3D312><SPAN class=3Dparameter>Enabled</SPAN> - =
turns the <SPAN=20
  class=3Dvalue>VRayIES</SPAN> light <SPAN class=3Dvalue>on</SPAN> and =
<SPAN=20
  class=3Dvalue>off</SPAN>.</P>
  <P>&nbsp;</P>
  <P><SPAN class=3Dbutton>Targeted</SPAN> - makes the <SPAN=20
  class=3Dvalue>VRayIES</SPAN> targeted.</P>
  <P>&nbsp;</P>
  <P><SPAN class=3Dbutton>IES file</SPAN> (button) - specify the .ies =
file that=20
  defines the light distribution.</P>
  <P>&nbsp;</P>
  <P><SPAN class=3Dparameter>Cutoff</SPAN> - this parameter specifies a =
threshold=20
  for the light intensity, below which the light will not be computed. =
This can=20
  be useful in scenes with many lights, where you want to limit the =
effect of=20
  the lights to some distance around them. Larger values cut away more =
from the=20
  light; lower values make the light range larger. If you specify <SPAN=20
  class=3Dvalue>0.0</SPAN>, the light will be calculated for all =
surfaces.</P>
  <P>&nbsp;</P>
  <P><SPAN class=3Dparameter>Shadow bias</SPAN> - bias moves the shadow =
toward or=20
  away from the shadow-casting object (or objects). If the Bias value is =
too=20
  low, shadows can "leak" through places they shouldn't, produce moire =
patterns=20
  or making out-of-place dark areas on meshes. If Bias is too high, =
shadows can=20
  "detach" from an object. If the Bias value is too extreme in either =
direction,=20
  shadows might not be rendered at all.</P>
  <P>&nbsp;</P>
  <P><SPAN class=3Dparameter>Sast shadows</SPAN> - when <SPAN=20
  class=3Dvalue>on</SPAN> (the default), the light casts shadows. Turn =
this option=20
  <SPAN class=3Dvalue>off</SPAN> to disable shadow casting for the =
light.</P>
  <P>&nbsp;</P>
  <P><SPAN class=3Dparameter>Use light shape</SPAN> - when this option =
is <SPAN=20
  class=3Dvalue>on</SPAN> (the default) the shape of the light specified =
in the=20
  .ies light will be taken into consideration during the calculation of =
shadows.=20
  Turn this option <SPAN class=3Dvalue>off</SPAN> to create sharp =
shadows.</P>
  <P>&nbsp;</P>
  <P><SPAN class=3Dparameter>Shape subdivs</SPAN> - this value controls =
the number=20
  of samples V-Ray takes to compute lighting. Lower values mean more =
noisy=20
  results, but will render faster. Higher values produce smoother =
results but=20
  take more time. Note that the actual number of samples also depends on =
the <A=20
  =
href=3D"http://www.spot3d.com/vray/help/150SP1/render_params_dmc.htm">DMC=
=20
  Sampler settings</A>. </P>
  <P>&nbsp;</P>
  <P><SPAN class=3Dparameter>Color mode</SPAN> - allows you to select =
the mode in=20
  which the color of the light will be determined:</P>
  <P>&nbsp;</P>
  <BLOCKQUOTE>
    <P><SPAN class=3Dvalue>Color</SPAN> - the light color is directly =
specified by=20
    the <SPAN class=3Dparameter>Color</SPAN> parameter.<BR></P>
    <P><SPAN class=3Dvalue>Temperature</SPAN> - the light color =
temperature (in=20
    <SPAN class=3Dvalue>Kelvin</SPAN>) is specified by the <SPAN=20
    class=3Dparameter>Temperature</SPAN> parameter.</P></BLOCKQUOTE>
  <P>&nbsp;</P>
  <P><SPAN class=3Dparameter>Color</SPAN> - when the <SPAN =
class=3Dparameter>Color=20
  mode</SPAN> is set to <SPAN class=3Dvalue>Color</SPAN> this parameter =
determines=20
  the color of the light.</P>
  <P>&nbsp;</P>
  <P><SPAN class=3Dbutton>Color temperature</SPAN> - when the <SPAN=20
  class=3Dparameter>Color mode</SPAN> is set to <SPAN=20
  class=3Dvalue>Temperature</SPAN> this parameter determines the color =
temperature=20
  (in <SPAN class=3Dvalue>Kelvin</SPAN>) of the light.</P>
  <P>&nbsp;</P>
  <P><SPAN class=3Dparameter>Power</SPAN> - determines the intensity of =
the light=20
  in lumens.<BR><BR><SPAN class=3Dparameter>Area speculars</SPAN> - when =
this=20
  option is <SPAN class=3Dvalue>Off</SPAN> the particular light will be =
rendered=20
  as a point light in the specular reflections </P>
  <P>&nbsp;</P>
  <P><SPAN class=3Dbutton>Exclude</SPAN> - this button brings up the 3ds =
Max=20
  include/exclude button which allows the user to exclude objects from=20
  illumination and shadow casting.</P></BLOCKQUOTE>
<H2><A name=3Dnotes></A>Notes</H2>
<BLOCKQUOTE>
  <P>&nbsp;</P></BLOCKQUOTE>
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