Bad shadowing

I recently imported a little road for a infinite generating terrain when character moves forward, the main problem is that the shadow from the trees don’t build propely, giving me these disgusting looking shadow effects:

I even had to move the camera outside the postprocessing volume so the lightning would build faster.

What option causes this shadow error?

You can try updating the Lightmap density of the sahdow receiving mesh

And it’ll cost a lot of lightning build time, right?

Should’ve taken the screenshot with the message log the first time:

Edit: I’m using cinema 4D for 3D programming

Then you can try Dynamic lighting. Another thing would be to use Distance Fields

create a second UV channel for lightmap UV