Re: Texture mip streaming prioritization

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Thanks for your thoughts,

>Alternatively - object X is Y meters from camera - what should I load.
This is essentially what my current calculation gives me. It describes what
I need to load in order to render the seen at it's highest image quality.
The problem though is then applying a memory constraint to that, that says,
I can't have everything I need.... So what will I choose to load?

I must admit, I am currently thinking down the line that Sebastian
described above:
>Assuming you only load one MIP level at a time (i.e. if MIP N is currently
loaded, you'll only consider N-1), maybe something like:
>(desired_mip - current_mip) * num_pixels / memory_usage, add tuning knobs
as needed...

I have the concept of the "Ideal" mip I would like loaded.
And I also think dealing with one mip at a time (from prioritisation point
of view at least) makes sense.
Though that doesn't necessarily mean only one mip is loaded at a time, just
one mip is considered for being loaded at a time.

I'm thinking if I start with my "target set" as equal to the "ideal set",
then execute the following:

while (memoryUsage of target set > budget)
{
     sort target texture set according to the "Priority" of having it's
current target mip loaded.
     where priority = (idealMip - currentTargetMip) * numPixelsUsingTexture
/ MemoryUsage

     Select texture with the lowest priority

     subtract 1 from it's currentTargetMip.
}

This would remove all the mips that will have the least benifit to the
scene.
Then I would task the resource system with making sure the target set gets
loaded.

Unfortunately the above algorithm looks like it'd be very serial, and
involve a bunch of sorts... But I think it might acheive good results?

Have any of you seen these implementations executed in a product or game
before? Was it successful? Tricky? worth the time?

Thanks for the comments and suggestions so far,

Josh

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<div dir=3D"ltr">Thanks for your thoughts,<div><br>&gt;<span style=3D"font-=
family:arial,sans-serif;font-size:13px">Alternatively - object X is Y meter=
s from camera - what should I load.<br>This is essentially what my current =
calculation gives me. It describes what I need to load in order to render t=
he seen at it&#39;s highest image quality.<br>
The problem though is then applying a memory constraint to that, that says,=
 I can&#39;t have everything I need.... So what will I choose to load?<br><=
br></span>I must admit, I am currently thinking down the line that Sebastia=
n described above:<span style=3D"font-family:arial,sans-serif;font-size:13p=
x"><br>
</span></div><div><div class=3D"gmail_extra">&gt;<span style=3D"font-family=
:arial,sans-serif;font-size:13px">Assuming you only load one MIP level at a=
 time (i.e. if MIP N is currently loaded, you&#39;ll only consider N-1), ma=
ybe something like:</span><br>
&gt;<span style=3D"font-family:arial,sans-serif;font-size:13px">(desired_mi=
p - current_mip) * num_pixels=A0/ memory_usage, add tuning knobs as needed.=
..<br></span><br>I have the concept of the &quot;Ideal&quot; mip I would li=
ke loaded.<br>
And I also think dealing with one mip at a time (from prioritisation point =
of view at least) makes sense.=A0</div><div class=3D"gmail_extra">Though th=
at doesn&#39;t necessarily mean only one mip is loaded at a time, just one =
mip is considered for being loaded at a time.<br>
<br>I&#39;m thinking if I start with my &quot;target set&quot; as equal to =
the &quot;ideal set&quot;, then execute the following:<br><br>while (memory=
Usage of target set &gt; budget)<br>{<br>=A0 =A0 =A0sort target texture set=
 according to the &quot;Priority&quot; of having it&#39;s current target mi=
p loaded.</div>
<div class=3D"gmail_extra">=A0 =A0 =A0where priority =3D (idealMip - curren=
tTargetMip) * numPixelsUsingTexture / MemoryUsage<br>=A0 =A0=A0<br>=A0 =A0 =
=A0Select texture with the lowest priority<br>=A0 =A0 =A0<br>=A0 =A0 =A0sub=
tract 1 from it&#39;s currentTargetMip.<br>
}<br><br>This would remove all the mips that will have the least benifit to=
 the scene.<br>Then I would task the resource system with making sure the t=
arget set gets loaded.</div></div><div class=3D"gmail_extra"><br>Unfortunat=
ely the above algorithm looks like it&#39;d be very serial, and involve a b=
unch of sorts... But I think it might acheive good results?<br>
<br></div><div class=3D"gmail_extra">Have any of you seen these implementat=
ions executed in a product or game before? Was it successful? Tricky? worth=
 the time?<br></div><div class=3D"gmail_extra"><br></div><div class=3D"gmai=
l_extra">
Thanks for the comments and suggestions so far,=A0<br><br>Josh<br><br><br><=
/div></div>

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