3D grass shader to mimic large grass field

[Zhi]

Originally Posted by JvdBosch

The setScale indeed rescales the copy of the texture, to be re-applied to the node and blended with the original texture.

I don't get your second question... Could you clarify it?

My understanding of the node.texblend() method is that it blends the two texture layers of the same entity. In my case, it is the ground. If the ground is only a single entity, this might work. However, the grass texture I have only matches 2 m x 2 m area (if you apply it to a larger area, it looks not real). To have a larger area of grass field, I have to repeat the ground patch (in my case, more than 2000 repeats). Although the texture itself is seamless (it is amazingly made), it contains both high spatial frequency and low spatial frequency components. The high spatial frequency component will make the repeated ground contain noticeable linear perspective cue. It is trivial for most VR applications, such as games. But, it is not good for some spatial perception experiments, because the real grass field do not have such a strong linear perspective cue. The trick I used here is to superimpose a huge texture (the 100m x 100m patch), which only contains low frequency component. This will substantially reduce the noticeable linear perspective cure. See the attached screen shots for comparison. To do this, I used the node.alpha() method. My question is whether the node.texblend() method can accomplish it as well.