Hi,
"'... tried to make some 2m² grass patch but the trimming in't really clean as he is in the preview ..."
The
Edge Boundary Checking is removing elements within one item that are "based out of area used for distribution" - having any "overhanging faces" under one element, these will be fully removed or not, depending if the element is based inside/outside of the distribution area.
If any gaps appear, a recommendable way to fix these areas would be to adjust
Distribution Map settings -
Density or
Offset X /
Y values. That should fix it (as shown on attached screen-shots).
As mentioned above, there is no "physical cut" performed while using the Edge Boundary Checking mode (as this would be extremely resource demanding). This "trimmed part" is treated by the render engine as a kind of "Matte object" internally (this way render engine ignores it for its calculations).
"it doesn't follow a fine surface, and we have "flying part of the pattern""
I would suggest you to check the
Direction settings under the
Surface tab (probably is set to 100). In case of large clumps I would recommend you to set it to Surface's
Normal (0). Specially for these purposes, you can take advantage of
Scale to fit sloped area option. You can find more about these setting in our
on-line reference guide.
Best regards,