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Motion blurring texture

Motion blurring texture

2004-04-23       - By Halfdan Ingvarsson

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Reply:     1     2     3     4     5  

It's due to the fact that texture coordinates are baked into the object at each
frame. The relative motion of the object then affects the texture since the
texture coordinates are fixed in time even though the texture support is not
moving relative to the object.

Since mental ray doesn't support motion vectors on texture coordinates (nor
does any renderer that I can think of) the only solution is to use purely
implicit texture support. This generates texture coordinates at render time, in
a shader, and will give you the frozen result you're after. It'll be a bit
trickier to set up though.

You could also use a light projection, if you're feeling frisky.

- ½

-- --Original Message-- --
From: owner-xsi@(protected) [mailto:owner-xsi@(protected)]On Behalf
Of Jeff McFall
Sent: Friday, 23 April, 2004 19:04
To: XSI@(protected)
Subject: RE: Motion blurring texture


Scanline is not enabled.  Ill look into the settings and options you have
suggested.

Thank you
Jeff

-- --Original Message-- --
From: Jim Rothrock [mailto:jimr@(protected)]
Sent: Friday, April 23, 2004 6:19 PM
To: XSI@(protected)
Subject: Re: Motion blurring texture


Are you rendering with "scanline rapid" motion blur?  If so, this is the
expected behavior, sometimes known as "RenderMan-style" motion blur.  To
eliminate this artifact, change "scanline rapid" to "scanline on."  This will
probably result in significantly slower rendering.  If you want to continue to
use "scanline rapid" and are using stand-alone mental ray 3.3, you can reduce
the blurring by setting the "samples motion" option to a value greater than 1.
Greater values will result in less blur, but longer rendering times.
--
Jim Rothrock | jimr@(protected)
-- -- Original Message -- --
From: "Jeff McFall" <Jeff.McFall@(protected)>
To: <XSI@(protected)>
Sent: Friday, April 23, 2004 2:17 PM
Subject: Motion blurring texture


Im not sure if this would be considered a bug necessarily, but it is not what I
would consider a correct result either.

These 2 images represent part of a sequence where this red dot travels aross
the screen.  The texture support is stationary so that the texture "slides"
along the dot as the dot moves past it.

Since the texture support is detached from the object and stationary I would
not expect the texture to be affected by motion blur, however it is as can be
seen in the dot_blur.jpg image.

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<P><FONT SIZE=2>It's due to the fact that texture coordinates are baked into
the object at each frame. The relative motion of the object then affects the
texture since the texture coordinates are fixed in time even though the texture
support is not moving relative to the object.</FONT></P>

<P><FONT SIZE=2>Since mental ray doesn't support motion vectors on texture
coordinates (nor does any renderer that I can think of) the only solution is to
use purely implicit texture support. This generates texture coordinates at
render time, in a shader, and will give you the frozen result you're after. It
'll be a bit trickier to set up though.</FONT></P>

<P><FONT SIZE=2>You could also use a light projection, if you're feeling frisky
.</FONT>
</P>

<P><FONT SIZE=2>- ½</FONT>
</P>

<P><FONT SIZE=2>-- --Original Message-- --</FONT>

<BR><FONT SIZE=2>From: owner-xsi@(protected) [<A HREF="mailto:owner-xsi
@(protected)">mailto:owner-xsi@(protected)</A>]On Behalf</FONT>

<BR><FONT SIZE=2>Of Jeff McFall</FONT>

<BR><FONT SIZE=2>Sent: Friday, 23 April, 2004 19:04</FONT>

<BR><FONT SIZE=2>To: XSI@(protected)</FONT>

<BR><FONT SIZE=2>Subject: RE: Motion blurring texture </FONT>
</P>
<BR>

<P><FONT SIZE=2>Scanline is not enabled.&nbsp; Ill look into the settings and
options you have suggested.</FONT>
</P>

<P><FONT SIZE=2>Thank you </FONT>

<BR><FONT SIZE=2>Jeff</FONT>
</P>

<P><FONT SIZE=2>-- --Original Message-- --</FONT>

<BR><FONT SIZE=2>From: Jim Rothrock [<A HREF="mailto:jimr@(protected)"
>mailto:jimr@(protected)</A>] </FONT>

<BR><FONT SIZE=2>Sent: Friday, April 23, 2004 6:19 PM</FONT>

<BR><FONT SIZE=2>To: XSI@(protected)</FONT>

<BR><FONT SIZE=2>Subject: Re: Motion blurring texture </FONT>
</P>
<BR>

<P><FONT SIZE=2>Are you rendering with &quot;scanline rapid&quot; motion blur?
&nbsp; If so, this is the expected behavior, sometimes known as &quot;RenderMan
-style&quot; motion blur.&nbsp; To eliminate this artifact, change &quot
;scanline rapid&quot; to &quot;scanline on.&quot;&nbsp; This will probably
result in significantly slower rendering.&nbsp; If you want to continue to use
&quot;scanline rapid&quot; and are using stand-alone mental ray 3.3, you can
reduce the blurring by setting the &quot;samples motion&quot; option to a value
greater than 1.&nbsp; Greater values will result in less blur, but longer
rendering times.</FONT></P>

<P><FONT SIZE=2>--</FONT>

<BR><FONT SIZE=2>Jim Rothrock | jimr@(protected)</FONT>

<BR><FONT SIZE=2>-- -- Original Message -- -- </FONT>

<BR><FONT SIZE=2>From: &quot;Jeff McFall&quot; &lt;Jeff.McFall@(protected)&gt;<
/FONT>

<BR><FONT SIZE=2>To: &lt;XSI@(protected)&gt;</FONT>

<BR><FONT SIZE=2>Sent: Friday, April 23, 2004 2:17 PM</FONT>

<BR><FONT SIZE=2>Subject: Motion blurring texture</FONT>
</P>
<BR>

<P><FONT SIZE=2>Im not sure if this would be considered a bug necessarily, but
it is not what I would consider a correct result either.</FONT>
</P>

<P><FONT SIZE=2>These 2 images represent part of a sequence where this red dot
travels aross the screen.&nbsp; The texture support is stationary so that the
texture &quot;slides&quot; along the dot as the dot moves past it.</FONT></P>

<P><FONT SIZE=2>Since the texture support is detached from the object and
stationary I would not expect the texture to be affected by motion blur,
however it is as can be seen in the dot_blur.jpg image.</FONT></P>

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