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atrodler

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Reply with quote  #1 
A little clarification was requested so I've added a few more steps to this tutorial. It's no secret that 2D grass (basically the texture applied to the horizontal ground plane) is very ineffective. Less so because of the quality of the texture and more so due to the inability make grass look vertical on a horizontal plane. It's all about your point of view... quite literally I might add.

So, as usual, I've been experimenting. 

I'm sure we've all seen some version of street art that is a great example of perspectives completely created on a horizontal plane. Like this. Hmm, thought I. 
street art.jpg 
What did I do? (updated 3.5.17)
1. I created a grass texture.
grass texture 1.jpg 
2. import your new texture into sketchup. for now, leave the dimensions to whatever the default settings are.
1.png 

2.png 

3.png 
Scaled as is, (meaning leaving the H to W dimension ratios to 1:1) this orientation works for tree level bird's eye images similar to this one.  3203945
For ground level scenes, where the camera elevation is around 5' 6" you need to scale this texture a little differently. A 3 to 1 height to width ratio works well. You can edit the new texture, or duplicate it so you have two, one for ground level views, and one for bird's eye views.

3. scale it to 3:1
3.png 
double click on your new grass texture (above) to open the edit menu (below)
4.png 
Unlink the ratios by clicking on the chain link. Change either the width or the height so that your final texture dimensions are at 3:1, H:W ratio. For this exercise, I left the width as is and changed the height by 3x.
5.png 
then click the chain link again to lock your texture H:W ratio. You can always adjust the overall scale later, as well as adjust the ratios at any time to suit your needs.

back to the model.

4. I set up the ground plane so that I could apply, scale, and orient the texture to my vantage point. At this point the texture is now scaled if you followed item number 3 above. What you have to do now is physically divide your ground plane as seen here. This is necessary so that the texture appears correctly on the ground for the whole scene. Realize then that you have to divide your ground plane just enough to so that it extends beyond what will be seen in your final render.

Apply the grass to all surfaces in the array ... 

Then you want to edit the position of the grass in each segment so that it is oriented to the camera, which means that the grass should look like it is growing away from the camera.

so it looks like this.
grass test layout.jpg 
close up
grass test layout 2.jpg 
5. this is the raw rendering. grass test render.jpg 
6. this is the final. with the right brush, pp edits took 10 minutes max. 
grass test final.jpg 

7. for pp editing with 'the right brush' I used a variety of grass profile brushes which can be found (photoshop brushes are *.abr files) and added to your brush collection. I use the rubber stamp tool which I find to be more effective than trying to match paint and grass blades. Use what the image gives you. I use similar settings as found in the flowers tutorial, there's clover in my lawn... adding flowers in PP such as scaling, jitter, angle... clone from nearby the edge I want to edit, and work my way aound the image. 

Effective? I think so. Maybe not as nice as 2.5D grass but, it is quick, easy, and doesn't require all the components, like 2.5D grass... or 3D for that matter. for models with large lawns, this may be a nice alternative.

experiment complete. [thumb]


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arqcova

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Reply with quote  #2 
nice experiment!
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matolala

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Reply with quote  #3 
ingenious [eek]
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matolala

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Reply with quote  #4 
Please can you mail me a full resolution of the grass texture matolala@yahoo.com. Hope its free
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Natstar

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Reply with quote  #5 
Hi Andrew,

This looks very interesting, thanks for sharing this. You have explained it well and the results do look very good.

I hope to try it out myself.

regards,
Nat

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jlo

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Reply with quote  #6 
This is a plugin waiting to happen! 
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