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>Blender Documentation Volume I - User Guide: Last modified April 29 2004 S68</TH
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><H1
CLASS="section"
><A
NAME="section_yafray_background"
></A
>Background</H1
><P
> Adds a background image (environment map), colour or sky to your render.
</P
><P
> Pathlight and Hemilight can sample the background colour and intensity to simulate real
world lighting
</P
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="section_yafray_background_normal"
></A
>Normal Image Background</H2
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><PRE
CLASS="programlisting"
> <background type="image" name="envnorm" power="1.000000">
<filename value="C:\directory\image.jpg"/>
</background>
</PRE
></TD
></TR
></TABLE
><P
></P
><UL
><LI
><P
> <TT
CLASS="literal"
>type - image</TT
>: Allows you to
use a bitmap image of one of the supported
texture formats as a background. The image is mapped around the
scene as a sphere, so the image should be in lattitude/longitude
format (ratio 2:1)
</P
></LI
><LI
><P
> <TT
CLASS="literal"
>name</TT
>: Background Name
</P
></LI
><LI
><P
> <TT
CLASS="literal"
>Power</TT
>: Level of brightness
of the bitmap. 1.0 is default, greater numbers will increase
brightness, lower numbers will decrease brightness
</P
></LI
><LI
><P
> <TT
CLASS="literal"
>filename</TT
>: full path & filename of the image,
including the file extension
</P
></LI
></UL
></DIV
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="section_yafray_background_hdri"
></A
>HDRI Background</H2
><TABLE
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><PRE
CLASS="programlisting"
> <background type = "HDRI" name = "envhdri" exposure_adjust = "0">
<filename value = "C:\directory\image.hdr" />
</background>
</PRE
></TD
></TR
></TABLE
><P
></P
><UL
><LI
><P
> <TT
CLASS="literal"
>type - HDRI</TT
>: allows you to
use a HDR image as a background. The HDRI is mapped around the scene
as an angular map, not latitude longitude like the normal image
background
</P
></LI
><LI
><P
> <TT
CLASS="literal"
>name</TT
>: Background Name
</P
></LI
><LI
><P
> <TT
CLASS="literal"
>exposure_adjust</TT
>: Similar to
'power' for a normal image background. 0 is default, increasing this
will brighten the HDR, decreasing will darken (equivilent to
adjusting the f-stop on a physical camera)
</P
></LI
><LI
><P
> <TT
CLASS="literal"
>filename</TT
>: full path & filename of the HDRI,
including the file extension
</P
></LI
></UL
></DIV
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="section_yafray_background_constant"
></A
>Constant Background</H2
><TABLE
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><TD
><PRE
CLASS="programlisting"
> <background type="constant" name = "constbackg">
<color r="1.000000" g="1.000000" b="1.000000"/>
</background>
</PRE
></TD
></TR
></TABLE
><P
></P
><UL
><LI
><P
> <TT
CLASS="literal"
>type - constant</TT
>: lets you
assign a single colour as the background
</P
></LI
><LI
><P
> <TT
CLASS="literal"
>name</TT
>: Background Name
</P
></LI
><LI
><P
> <TT
CLASS="literal"
>color</TT
>: r - red value of color (0.000000 - 1.000000) g
- green value of color (0.000000 - 1.000000) g - green value of
color (0.000000 - 1.000000). 1/1/1 is white, 0/0/0 is black
</P
></LI
></UL
></DIV
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="section_yafray_background_sunsky"
></A
>Sun/Sky Background</H2
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
> <background type="sunsky" name ="Sun1" turbidity ="4.000000" add_sun="on" sun_power="1.000000"
a_var="1.000000" b_var="1.000000" c_var="1.000000" d_var="1.000000" e_var="1.000000" >
<from x="-0.007401" y="8.589217" z="3.737965"/>
</background>
</PRE
></TD
></TR
></TABLE
><P
></P
><UL
><LI
><P
> <TT
CLASS="literal"
>type - sunsky</TT
>: lets you
assign a realistic sky background with optional sun
</P
></LI
><LI
><P
> <TT
CLASS="literal"
>turbidity</TT
>: Atmosphere density (eg mist/fog) the lower
the number, the less visible the sky is. A value of 4 is a clear
sky.
</P
></LI
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