<div dir="ltr"><div>Not entirely related, but will the scope of this GSOC cover curved motion blur?<br><br></div>-NateW<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Jun 10, 2013 at 11:29 AM, Brecht Van Lommel <span dir="ltr"><<a href="mailto:brechtvanlommel@pandora.be" target="_blank">brechtvanlommel@pandora.be</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Yes Blender supports this, it does scene.frame_set(frame, 0.0) now,<br>
the second value is a subframe value between 0.0 and 1.0.<br>
<div class="HOEnZb"><div class="h5"><br>
On Mon, Jun 10, 2013 at 4:58 PM, Gavin Howard <<a href="mailto:gavin.d.howard@gmail.com">gavin.d.howard@gmail.com</a>> wrote:<br>
> Hello,<br>
><br>
> Does Blender allow exporting at arbitrary subframes? If not, that might<br>
> be a problem. If so, then Stuart has me exploring the code, and I think that<br>
> I could write the patch while doing so. Does that sound okay?<br>
><br>
> God Bless,<br>
> Gavin Howard<br>
><br>
> On Jun 9, 2013 6:34 AM, "Brecht Van Lommel" <<a href="mailto:brechtvanlommel@pandora.be">brechtvanlommel@pandora.be</a>><br>
> wrote:<br>
>><br>
>> We should support exporting at the exact shutter time. At the time I<br>
>> implemented motion blur evaluation at subframes was actually broken<br>
>> for shape keys and physics systems so I didn't use it, but that has<br>
>> been fixed since.<br>
>><br>
>> However, exporting motion from the frame positions may be useful to<br>
>> keep as it may give more predictable results in some cases. When<br>
>> you're editing animations that's the only thing you actually see in<br>
>> animation playback, so the motion between those frames may contain<br>
>> some unexpected things that you don't want to render.<br>
>><br>
>> I don't know how common that is, did not look at .blend files yet to<br>
>> see how different the results are, if it is an issue we should<br>
>> probably have an option (off by default) to only export motion from<br>
>> integer frame numbers and no subframes.<br>
>><br>
>> On Sat, Jun 8, 2013 at 7:36 PM, Gavin Howard <<a href="mailto:gavin.d.howard@gmail.com">gavin.d.howard@gmail.com</a>><br>
>> wrote:<br>
>> > Hello all,<br>
>> ><br>
>> > I have a question about implementation. I have been told by<br>
>> > Brecht that currently, the Cycles addon exports three steps for motion<br>
>> > blur to the renderer: one at the previous frame, one at the current<br>
>> > frame, and one at the next frame.<br>
>> ><br>
>> > Now, my memory may not be serving me well here, so I may have<br>
>> > gotten the details wrong. But if not, shouldn't the addon actually use<br>
>> > the shutter time to determine the first and third steps? For example,<br>
>> > shouldn't the addon export a step at the start of the shutter time,<br>
>> > one at the current frame, and one at the end of the shutter time?<br>
>> > Also, I think this type of reasoning should apply even when multi-step<br>
>> > (more than 3) motion blur is added. (Multi-step blur is needed for my<br>
>> > Deformation Motion Blur GSoC project, so I will add it over the<br>
>> > summer.)<br>
>> ><br>
>> > In short, I think that the shutter time should be the goto for<br>
>> > exporting motion blur steps. If it is, then just ignore this. But if<br>
>> > it's not, should we change it? Anyway, that's my two cents.<br>
>> ><br>
>> > God Bless,<br>
>> > Gavin Howard<br>
>> > _______________________________________________<br>
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><br>
><br>
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</div></div></blockquote></div><br></div>