Setting grass blade rotation using normal map

[fazil47]

Attempt at implementing #60. Check this comment for current status.

[EmiOnGit]

Thanks again for sharing your solution, this is already great! :) I noticed that when not defining the normal_map, therefore using the default fallback image (which is a 1x1-white texture), the grass is not pointing up.

To fix that I'm thinking about:

• Not including the normal_map in the bundle and set a flag, similar to the HEIGHT_TEXTURE-flag
• Construct a fallback image which is green (which would then correctly point up)
• Include a check in the shader to specifically handle this case

• What are your thoughts on this?

[fazil47]

I've added a green fallback texture, let me know if you prefer a different solution. I've also replaced grass_normal_map.png with grass_normal_map_alt.png because it's effect wasn't noticeable enough.

[fazil47]

Current state:

Without rotation:

Example 1

Normal map:  With rotation:  Bake settings: 

Example 2

Normal map:  With rotation: 

[fazil47]

I haven't tested WASM builds yet, what is the recommended way to do that?

[EmiOnGit]

Somehow my new comments are at my last review and not at the bottom.. Well, I think with this should be the last changes to fix all bugs.

Test I've been using

 which I generated using the same method as you from a hill with a platform above:  result (also used a white density, y-map for better view): 

I also like the changes in the example camera system. You can choose if you want to keep them or remove them, though I suggest to also note the keybindings in the examples like the others. I also think I'd like space and shift a bit more because it makes using the camera possible with only one hand (you can ignore this point if you don't agree)

[fazil47]

I've remapped the camera movement up to space and down to left shift. With that, should be ready to review.

[fazil47]

Also feel free to replace/delete the normal maps I've added.