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retiming value clips

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jparker
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Is there an efficient way in Solaris to alter the timing of value clips?

Using "timeshift" + "cache" does not alter the clip metadata but the actual primitive attributes, which makes sense.

But if I know I can retime the clip information only and change the metadata it would be much more efficient. I have already been able to do this via a VEX script but it's lots of code that seems like it should be wrapped up somewhere in a node.

Here is some example VEX that I wrote to change clip metadata (we have internal examples that use spline lookups for more complicated retimes):

int stride = 3000;

string clips[] = {"default"};

foreach (string clip; clips)
{
    string assets[] = usd_metadata(0, @primpath, "clips:" + clip + ":assetPaths");
    vector2 times[] = usd_metadata(0, @primpath, "clips:" + clip + ":times");

    vector2 active_out[];
    vector2 times_out[];
    
    for (int i=0; i<len(assets); i++)
    {
        append(times_out, set(i*stride, times[i][1]));
        append(active_out, set(i*stride, i));
    }
    
    usd_setmetadata(0, @primpath, "clips:" + clip + ":times", times_out);
    usd_setmetadata(0, @primpath, "clips:" + clip + ":active", active_out);    
    usd_setmetadata(0, @primpath, "clips:" + clip + ":interpolateMissingClipValues", 1);
}
Edited by jparker - 2024年12月15日 02:16:40
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jparker
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Also somewhat related to this, is there a way to cache time samples on only *specific* prims, rather than the entire stage?

The scenario I have is that I am using the timeshift LOP on a particular prim, but there are no parameters to re-calculate the full frame range so I end up with a time dependency in the node graph. If I attempt a cache node afterwards, any value clips are cached in full per-frame which I don't want.
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