Minor readability issue - image 18b about gltf-tutorials

[javagl]

Just to confirm: The Image 18b contains the computation

         ( 0.5,  0.5,  0.0)
+ 1.0  * ( 1.0,  1.0,  0.0)
+ 0.25 * (-1.0,  1.0,  0.0)
=        ( 1.25, 1.75, 0.0)

and the question is where the factors 1.0 and 0.25 come from, is that correct?

I agree that it could make sense to swap the rows + 1.0... and + 0.25... (and I'm not sure why I wrote them in this order right now...). Do you think that this could be sufficient to avoid the confusion?

Otherwise, some details could be added. Maybe by some additional statement in the preceding text, roughly like that:

At the time stamp 1.25, the weights for the morph targets are computed by the animation sampler (maybe link to https://github.com/KhronosGroup/glTF-Tutorials/blob/master/gltfTutorial/gltfTutorial_007_Animations.md#animation-samplers here) as follows:
The weight for morph tarrget 0 (red) is (0.0 + 0.25 * (1.0 - 0.0)) = 0.25
The weight for morph tarrget 1 (green) is (1.0 + 0.25 * (1.0 - 1.0)) = 1.0

But that might be a bit too much detail here (and therefore, potentially confusing), given that the concept of computing animated values with a sampler is already explained with an example in the linked section.

[tim-rex]

Thanks Marco. I think it’s probably sufficient to swap the two rows. While it took me longer than I care to admit to realise this was the source of my confusion, once I realised everything made perfect sense.

[javagl]

I created a PR at #74 , swapping the rows and adding a short explanation for the values.