distance and size parameter

med-material / TunnelGoalFittsTests

Unity Sources for Goal Crossing, Steering Task and Fitts Law to benchmark physical abilities (fx head movement)

MIT License

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distance and size parameter #55

Closed hendrikknoche closed 3 years ago

hendrikknoche commented 3 years ago

using a combination of size 69 and distance 10 results in a negative ID (-2) (can fix on the Rshiny server) but need to make sure how distance and size relate.

bastianilso commented 3 years ago

ObjectDistanceCm is calculated from two items:

We look at the render bounds of each object, and calculate the distance between them - we use the coordinates places closest towards the middle of the screen.
We multiply the distance in px, with a "centimeters per pixel" value.
```
objectDistanceCm = objectDistanceScreen * centimetersPerPixel;
```

Does your fix work Hendrik? I'm wondering why we would need to add the object's width. But maybe the variables I use above are not what they seem..

bastianilso commented 3 years ago

Hmm, I guess by adding the object's width to the calculation, you actually make the measurement from the "centerpoint", rather than from the closest edge. (?)