Problems with animated rendertransform after upgrade

06 Aug 2026, 14:30

Hi there!
I recently upgraded our Noesis version from 3.2.7 -> 3.2.13, and after the upgrade some of our animation storyboards stopped working.
When I try to animate (UIElement.RenderTransform).(ScaleTransform.ScaleX), nothing happens anymore.

I'm supplying some XAML code, it works in XAML Toy, and 3.2.7, but not after upgrading to 3.2.13 (The opacity animation works, but the scaling does not)

<Grid xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Grid VerticalAlignment="Stretch" HorizontalAlignment="Center">
    <Grid.Triggers>
      <EventTrigger RoutedEvent="Grid.Loaded">
        <BeginStoryboard>
          <Storyboard RepeatBehavior="Forever" Duration="0:0:1.0">
            <DoubleAnimation Storyboard.TargetName="AnimEllipse"
              Storyboard.TargetProperty="(UIElement.RenderTransform).(ScaleTransform.ScaleX)" From="2" To="0.5"
              Duration="0:0:0.7" />
            <DoubleAnimation Storyboard.TargetName="AnimEllipse"
              Storyboard.TargetProperty="(UIElement.RenderTransform).(ScaleTransform.ScaleY)" From="2" To="0.5"
              Duration="0:0:0.7" />
            <DoubleAnimation Storyboard.TargetName="AnimEllipse" Storyboard.TargetProperty="Opacity" From="1" To="0"
              Duration="0:0:0.7" />
          </Storyboard>
        </BeginStoryboard>
      </EventTrigger>
    </Grid.Triggers>

    <Ellipse x:Name="AnimEllipse" Width="100" Height="100" Stroke="Red" RenderTransformOrigin="0.5,0.5" />
  </Grid>
</Grid>

Have you seen this before or can you reproduce it locally?

Chris

07 Aug 2026, 14:57

Actually, I tried it with the packaged 3.2.13 version of XAMLPlayer, and it animates correctly there, so not really sure what's wrong with our integration. I'm not getting any errors it just doesn't animate. This applies to all RenderTransform animations

07 Aug 2026, 15:42

It's strange, when debugging it in visual studio I can see it correctly animates the value, but then it seems to never update the rendertransform, or something else is updating it after?
It does box the new value, but I can't really follow it from there.

07 Aug 2026, 17:01

I guess it is just a typo, but you're trying to animate the ScaleTransform set in the RenderTransform property of AnimEllipse element, but that Ellipse doesn't have any RenderTransform assigned.

I've tried with the following xaml and it works fine in Noesis 3.2.13 XamlPlayer:

<Grid xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Grid VerticalAlignment="Stretch" HorizontalAlignment="Center">
    <Grid.Triggers>
      <EventTrigger RoutedEvent="Grid.Loaded">
        <BeginStoryboard>
          <Storyboard RepeatBehavior="Forever" Duration="0:0:1.0">
            <DoubleAnimation Storyboard.TargetName="AnimEllipse"
              Storyboard.TargetProperty="(UIElement.RenderTransform).(ScaleTransform.ScaleX)" From="2" To="0.5"
              Duration="0:0:0.7" />
            <DoubleAnimation Storyboard.TargetName="AnimEllipse"
              Storyboard.TargetProperty="(UIElement.RenderTransform).(ScaleTransform.ScaleY)" From="2" To="0.5"
              Duration="0:0:0.7" />
            <DoubleAnimation Storyboard.TargetName="AnimEllipse" Storyboard.TargetProperty="Opacity" From="1" To="0"
              Duration="0:0:0.7" />
          </Storyboard>
        </BeginStoryboard>
      </EventTrigger>
    </Grid.Triggers>

    <Ellipse x:Name="AnimEllipse" Width="100" Height="100" Stroke="Red" RenderTransformOrigin="0.5,0.5">
      <Ellipse.RenderTransform>
        <ScaleTransform/>
      </Ellipse.RenderTransform>
    </Ellipse>
  </Grid>
</Grid>

Could you confirm if this xaml still fails for you?

07 Aug 2026, 17:47

Oh, that does indeed work! Interesting. In the previous version this worked fine without defining the RenderTransform property. But this solves my issue, i'll just define the properties for our use cases with broken animations. Although if I may suggest, it should probably error if you are trying to animate an undefined rendertransform property?

Thanks regardless.

07 Aug 2026, 22:32

Indeed, I see that this was working in previous versions, but it was a side effect of incorrect code that happened to be very lucky and do that instead of crashing. :)

We have never returned errors when the target animations don’t exist. I can revisit this behavior if you’d like, please create a ticket for it if needed.

Thank you!

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