First of all, let me mention, that your source object animation is performed within one frame (there are just two key frames at 200 and 201), which is by far not ideal.
Anyway, as explained in our detailed Animating in Forest Pack
tutorial under the Set the starting frame with a map
part: "The grayscale range is equally divided by the Count value with the first frame represented by black and the last represented by white. When the colour exceeds a threshold, the next frame is displayed."
Because of that, in case of using the Checker
map (only 100% black and 100% white values) I would suggest you to lower the Count to 2 and readjust the Time Offset
to 100 (please check attached sample scene "150401_Random_from_Map_Checker_iToo"). In my example the source object animation starts at frame 150 and ends at frame 200, so by setting the Time Offset
to 50 it'll be played within Forest object in desired frame range 100 - 200. As you can double-check when using any other map with values between 100% black and 100% white (like the Gradient
map as shown in the other scene), than to archive similar effect you'll need to set Counter
to 2 +1 = 3 (now the interpolation needs to considered).
In the second scene "150401_Random_from_Map_Gradient_iToo" I've modified the Time Offset
(set to 5) & Count
(set to 11) values to show another possible way and hope that clears it up better.
The scheme of this work-flow would be following: If you want your Forest object animation to end at frame 200 adjust the end frame of your source object animation to the same frame. To play the whole animation between desired frame range (200 - 100 = 100 frames), the source animation should ideally take a half time (100 / 2 = 50 frames) - item that'll start first will end in the half and item that'll the last item will perform from the half of frame range till the end. Than the Count will handle its "steps" (as mentioned before for grayscale maps the value should be Steps + 1). Then the Time Offset
will handle the animation start (Time Offset
- 1) = animation length). Once adjusted this way you move your source object animation range freely to readjust the end of animation if needed.
These principles applied to your "one frame animation" are shown in the third sample scene "150401_Random_from_Map_Trigger_iToo". If this should start at frame 100, right values would be Time Offset
set to 10 & Count
to 11, having set "start" key frame at 199 and the "end" key at 200.
Regarding the problem in your scene I would suggest you to prepare the source object animation once again more carefully. Hope that helps.