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Subject: VRayShadow examples
Date: Sun, 14 Nov 2010 15:35:29 +0200
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>VRayShadow examples</TITLE>
<META content=3D"text/html; charset=3Diso-8859-1" =
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rel=3Dstylesheet type=3Dtext/css=20
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<META name=3DGENERATOR content=3D"MSHTML 8.00.7600.16671"></HEAD>
<BODY bgColor=3D#ffffff>
<TABLE class=3DnavTitle border=3D0 cellSpacing=3D10 cellPadding=3D4 =
width=3D"100%">
  <TBODY>
  <TR>
    <TD width=3D"100%">
      <H1>VRayShadow examples</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><A=20
      =
href=3D"http://www.spot3d.com/vray/help/150SP1/shadow_params.htm">VRaySha=
dow</A></DIV></TD></TR></TBODY></TABLE>
<P>&nbsp;</P>
<P><A=20
href=3D"http://www.spot3d.com/vray/help/150SP1/examples_shadows2.htm#ex1"=
>Example=20
1: VRayShadow as Raytraced and Area types / Subdivisions vs Quality /=20
Bias</A></P>
<P><A=20
href=3D"http://www.spot3d.com/vray/help/150SP1/examples_shadows2.htm#ex2"=
>Example=20
2: Area Shadow types: Box vs Sphere / U, V, W sizes</A></P>
<P><A=20
href=3D"http://www.spot3d.com/vray/help/150SP1/examples_shadows2.htm#ex3"=
>Example=20
3: Changing the Shadow Color</A></P>
<P>&nbsp;</P>
<P>&nbsp;</P>
<H2><A name=3Dex1></A>Example 1: VRayShadow as Raytraced and Area types=20
/Subdivisions vs Quality / Bias</H2>
<TABLE border=3D0 cellPadding=3D4 width=3D767>
  <TBODY>
  <TR>
    <TD width=3D156><A=20
      =
href=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/03=
_raytraced_colored.png"><IMG=20
      border=3D0=20
      =
src=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/03_=
raytraced_colored__S.png"=20
      width=3D300 height=3D175></A></TD>
    <TD vAlign=3Dtop width=3D601>
      <P class=3Dvalue>Transparent Shadows: on , Area Shadows: off</P>
      <P class=3Dvalue>Subdivisions: 8</P>
      <P>&nbsp;</P>
      <P>With these settings the <SPAN class=3Dvalue>VRayShadow</SPAN> =
acts like a=20
      Raytraced Shadow. In this case the <SPAN =
class=3Dvalue>Subdivisions</SPAN>=20
      have no effect on the final result. Notice that <SPAN=20
      class=3Dvalue>VRayShadow</SPAN> takes in concern only the geometry =
of the=20
      objects and the transparency of their materials (we have colored=20
      shadows).</P></TD></TR></TBODY></TABLE>
<TABLE border=3D0 cellPadding=3D4 width=3D767>
  <TBODY>
  <TR>
    <TD width=3D156><A=20
      =
href=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/03=
_raytraced_coloredOFF.png"><IMG=20
      border=3D0=20
      =
src=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/03_=
raytraced_coloredOFF__S.png"=20
      width=3D300 height=3D175></A></TD>
    <TD vAlign=3Dtop width=3D601>
      <P class=3Dvalue>Transparent Shadows: off , Area Shadows: off</P>
      <P class=3Dvalue>Subdivisions: 8</P>
      <P>&nbsp;</P>
      <P>Again <SPAN class=3Dvalue>VRayShadow</SPAN> acts like a =
Raytraced<SPAN=20
      class=3Dvalue> </SPAN>Shadow, but this time with Transparency =
<SPAN=20
      class=3Dvalue>off</SPAN>. Now we still get the transparent level =
due to the=20
      material, but we don't have the colors any =
more.</P></TD></TR></TBODY></TABLE>
<TABLE border=3D0 cellPadding=3D4 width=3D767>
  <TBODY>
  <TR>
    <TD width=3D156><A=20
      =
href=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/03=
_areaSUBS_8.png"><IMG=20
      border=3D0=20
      =
src=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/03_=
areaSUBS_8__S.png"=20
      width=3D300 height=3D175></A></TD>
    <TD vAlign=3Dtop width=3D601>
      <P class=3Dvalue>Transparent Shadows: on , Area Shadows: on</P>
      <P class=3Dvalue>Subdivisions: 8</P>
      <P>&nbsp;</P>
      <P>Now <SPAN class=3Dvalue>VRayShadow</SPAN> acts like an Area =
Shadow. See=20
      that further the rays fall on the shadow receiving surface - the =
blurrier=20
      the shadow gets. You can notice the grainy look which is due to =
low <SPAN=20
      class=3Dvalue>Subdivisions</SPAN> value. =
</P></TD></TR></TBODY></TABLE>
<TABLE border=3D0 cellPadding=3D4 width=3D767>
  <TBODY>
  <TR>
    <TD width=3D156><A=20
      =
href=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/03=
_areaSUBS_24.png"><IMG=20
      border=3D0=20
      =
src=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/03_=
areaSUBS_24__S.png"=20
      width=3D300 height=3D175></A></TD>
    <TD vAlign=3Dtop width=3D601>
      <P class=3Dvalue>Transparent Shadows: on , Area Shadows: on</P>
      <P class=3Dvalue>Subdivisions: 24</P>
      <P>&nbsp;</P>
      <P>Increasing the <SPAN class=3Dvalue>Subdivisions</SPAN> leads to =
better=20
      shadow quality. Of course that also leads to higher render time, =
as V-Ray=20
      calculates more samples, You can still notice some grain in the=20
    shadow.</P></TD></TR></TBODY></TABLE>
<TABLE border=3D0 cellPadding=3D4 width=3D767>
  <TBODY>
  <TR>
    <TD width=3D156><A=20
      =
href=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/03=
_areaSUBS_48.png"><IMG=20
      border=3D0=20
      =
src=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/03_=
areaSUBS_48__S.png"=20
      width=3D300 height=3D175></A></TD>
    <TD vAlign=3Dtop width=3D601>
      <P class=3Dvalue>Transparent Shadows: on , Area Shadows: on</P>
      <P class=3Dvalue>Subdivisions: 48</P>
      <P>&nbsp;</P>
      <P>Now with this value of <SPAN class=3Dvalue>Subdivisions</SPAN> =
we have a=20
      much better shadow quality. Using this parameter wisely can save =
lots of=20
      render time. </P></TD></TR></TBODY></TABLE>
<TABLE border=3D0 cellPadding=3D4 width=3D767>
  <TBODY>
  <TR>
    <TD width=3D156><A=20
      =
href=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/03=
_areaSUBS_8_Bias2.png"><IMG=20
      border=3D0 align=3Dtop=20
      =
src=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/03_=
areaSUBS_8_Bias2__S.png"=20
      width=3D300 height=3D175></A></TD>
    <TD vAlign=3Dtop width=3D601>
      <P class=3Dvalue>Transparent Shadows: on , Area Shadows: on</P>
      <P class=3Dvalue>Bias: 2.0 , Subdivisions: 8</P>
      <P>&nbsp;</P>
      <P>Biased shadow. Bias moves the shadow toward or away from the=20
      shadow-casting object (or objects). If the Bias value is too low, =
shadows=20
      can "leak" through places they shouldn't, produce moire patterns =
or making=20
      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=20
      direction, shadows might not be rendered at all. =
</P></TD></TR></TBODY></TABLE>
<P>&nbsp;</P>
<P>&nbsp;</P>
<H2><A name=3Dex2></A>Example 2: Area Shadow types: Box vs Sphere / U, =
V, W=20
sizes</H2>
<TABLE border=3D0 cellPadding=3D4 width=3D767>
  <TBODY>
  <TR>
    <TD width=3D156><A=20
      =
href=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/04=
_render_areaSubs16.png"><IMG=20
      border=3D0=20
      =
src=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/04_=
render_areaSubs16__S.png"=20
      width=3D300 height=3D175></A></TD>
    <TD vAlign=3Dtop width=3D601>
      <P>Type <SPAN class=3Dvalue>Sphere</SPAN> , <SPAN class=3Dvalue>U: =
10, V: 10,=20
      W:10</SPAN></P>
      <P>&nbsp;</P>
      <P>When this type is chosen, the <SPAN =
class=3Dvalue>VRayShodow</SPAN> takes=20
      under consideration only the <SPAN class=3Dvalue>U</SPAN> size =
value. The=20
      <SPAN class=3Dvalue>V</SPAN> and <SPAN class=3Dvalue>W</SPAN> =
sizes don't=20
      affect the final result. In other words, this means, that our =
light source=20
      has a Sphere form and emits rays equally in all directions.=20
  </P></TD></TR></TBODY></TABLE>
<TABLE border=3D0 cellPadding=3D4 width=3D767>
  <TBODY>
  <TR>
    <TD width=3D156><A=20
      =
href=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/04=
_render_box_U2_V20.png"><IMG=20
      border=3D0=20
      =
src=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/04_=
render_box_U2_V20__S.png"=20
      width=3D300 height=3D175></A></TD>
    <TD vAlign=3Dtop width=3D601>
      <P>Type <SPAN class=3Dvalue>Box </SPAN>, <SPAN class=3Dvalue>U: 2, =
V: 20,=20
      W:10</SPAN></P>
      <P>&nbsp;</P>
      <P>Now the light source has a Box form. In this case VRayShodow =
takes=20
      under consideration all the <SPAN class=3Dvalue>U, V, W</SPAN> =
size values.=20
      See how the shodow is strong according to the <SPAN =
class=3Dvalue>U</SPAN>=20
      axis and is much softer to the <SPAN class=3Dvalue>V</SPAN> one=20
  .</P></TD></TR></TBODY></TABLE>
<TABLE border=3D0 cellPadding=3D4 width=3D767>
  <TBODY>
  <TR>
    <TD width=3D156><A=20
      =
href=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/04=
_render_box_U40_V2.png"><IMG=20
      border=3D0=20
      =
src=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/04_=
render_box_U40_V2__S.png"=20
      width=3D300 height=3D175></A></TD>
    <TD vAlign=3Dtop width=3D601>
      <P>Type <SPAN class=3Dvalue>Box </SPAN>, <SPAN class=3Dvalue>U: =
40, V: 2,=20
      W:10</SPAN></P>
      <P> </P>
      <P>Now the shadow is looking very different compared to the =
previous one.=20
      You can notice how the sizes' values has influenced the final =
result of=20
      it.</P></TD></TR></TBODY></TABLE>
<P>&nbsp;</P>
<H2><A name=3Dex3></A>Example 3: Changing the Shadow Color</H2>
<TABLE border=3D0 cellPadding=3D4 width=3D767>
  <TBODY>
  <TR>
    <TD width=3D156><A=20
      =
href=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/04=
_render_default.png"><IMG=20
      border=3D0=20
      =
src=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/04_=
render_default__S.png"=20
      width=3D300 height=3D175></A></TD>
    <TD vAlign=3Dtop width=3D601>
      <P><SPAN class=3Dvalue>Transparent Shadows</SPAN> <SPAN=20
      class=3Dvalue>on</SPAN>. </P>
      <P>&nbsp;</P>
      <P>&nbsp;</P>
      <P>In this case the Color value (R,G,B) in the Shadow Parameters =
rollout=20
      has <B>no</B> effect. In order to change the shadow color the =
<SPAN=20
      class=3Dvalue>Transparent</SPAN> parameter has to be <SPAN =
class=3Dvalue>off.=20
      </SPAN>See next images.</P></TD></TR></TBODY></TABLE>
<TABLE border=3D0 cellPadding=3D4 width=3D767>
  <TBODY>
  <TR>
    <TD width=3D156><A=20
      =
href=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/04=
_render_SPH_GreenSH.png"><IMG=20
      border=3D0=20
      =
src=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/04_=
render_SPH_GreenSH__S.png"=20
      width=3D300 height=3D175></A></TD>
    <TD vAlign=3Dtop width=3D601>
      <P><SPAN class=3Dvalue>Transparent Shadows off</SPAN>. </P>
      <P>&nbsp;</P>
      <P>Shadow Color Green.</P></TD></TR></TBODY></TABLE>
<TABLE border=3D0 cellPadding=3D4 width=3D767>
  <TBODY>
  <TR>
    <TD width=3D156><A=20
      =
href=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/04=
_render_SPH_RedSH.png"><IMG=20
      border=3D0=20
      =
src=3D"http://www.spot3d.com/vray/help/150SP1/images/examples/shadows/04_=
render_SPH_RedSH__S.png"=20
      width=3D300 height=3D175></A></TD>
    <TD vAlign=3Dtop width=3D601>
      <P><SPAN class=3Dvalue>Transparent Shadows off</SPAN>. </P>
      <P>&nbsp;</P>
      <P>Shadow Color Red.</P></TD></TR></TBODY></TABLE>
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