Thanks! It progress! Now I would know is there a way to disable the shadows on the sides, I mean all the sides of the mesh being in the same colors no matter the orientations of itself or of the light.
Actually my final goal is to make the lower part of my grass “mix” with the landscape to make the seam invisible and the upper part a little brighter with a gradiant. Maybe there is a quicker way to do that
The shading in on the side is due to the vertex normals on the 3d model, you can set the vertex normals to straight up in your 3d application so the grass normals will match the ground normals.
If you leave normal node to blank then it’s automatically use vertex normal. If you use [World normal] visualization mode you clearly see discontinuation at normals. If you disable [use tangent sapce normal] for foliage and then plug constant vector3 = (0,0,1) to normal node you should see improvement.
All lighting is calculated by using pixel normal and light direction. If that scene contain normal that point upwards and light source is from the above it should work fine. Can you show visualization of world normals?