Hi khongten. Here´s the tutorial.
I have a very bad english but i wish you understand...
CLIP MAPPING A TREE.
1- You have to get your tree image with transparent background and with it's alpha
It's more usual to find *.tif images with transparent background in internet, but if you use that kind of images you'll need to convert this image into another vray supported format later.
In this case i`m going to do with the *.tif image, so i will use:
- (Tree Image).tif (optional)
- (Tree Image).png, bmp, jpg, jpeg or tga.
- (Tree Image Alpha).jpg

2- If you don't have the alpha image, you can make it with photoshop (go to Channels and copy the alpha).
3- Import your (Tree Image).tif into SketchUp as an image, scale and position it where you want

4- Explode it
5- Select the image an make it component. The component must have enabled "Allways face camera" option, and it will be necessary to assign the axes of the component again.
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6- In V-Ray Material Panel, Add a new Vray linked material. Your image now is a texture since you explode it, so it will be in the list. select it.
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7- In Diffuse Channel, click on "m" that is close to "Color" an select:
Type: Bitmap. Go to "M" that is close to "File" and search in your hard disc your (Tree Image).jpg image.
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8- In Diffuse Channel, click on "m" that is close to "Transparency" an select:
Type: Bitmap. Go to "M" that is close to "File" and search in your hard disc your (Tree Image Alpha).jpg image. Don`t forget to activate "invert" and "invert Alpha".

9- In "Maps", click on "m" that is close to "Background" an select:
Type: Bitmap. Go to "M" that is close to "File" and search in your hard disc your (Tree Image Alpha).jpg image. Don`t forget to activate "invert" and "invert Alpha".

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10- Remove the refraction channel that vray has added to your image's background.

11- Render!
Sky Dome:

Phisical Sky:
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I'm not an expert at VRay so if anyone knows a better way to do it please tell me. I'm sure there are a lot of easyer methods, but i only know this way.
Note: It seems that if you delete your tree image or you move the skp model or the image, it doesn`t work anymore, so you have to keep into the same folder the model and images.
I have a very bad english but i wish you understand...
CLIP MAPPING A TREE.
1- You have to get your tree image with transparent background and with it's alpha
It's more usual to find *.tif images with transparent background in internet, but if you use that kind of images you'll need to convert this image into another vray supported format later.
In this case i`m going to do with the *.tif image, so i will use:
- (Tree Image).tif (optional)
- (Tree Image).png, bmp, jpg, jpeg or tga.
- (Tree Image Alpha).jpg

2- If you don't have the alpha image, you can make it with photoshop (go to Channels and copy the alpha).
3- Import your (Tree Image).tif into SketchUp as an image, scale and position it where you want

4- Explode it
5- Select the image an make it component. The component must have enabled "Allways face camera" option, and it will be necessary to assign the axes of the component again.

6- In V-Ray Material Panel, Add a new Vray linked material. Your image now is a texture since you explode it, so it will be in the list. select it.

7- In Diffuse Channel, click on "m" that is close to "Color" an select:
Type: Bitmap. Go to "M" that is close to "File" and search in your hard disc your (Tree Image).jpg image.

8- In Diffuse Channel, click on "m" that is close to "Transparency" an select:
Type: Bitmap. Go to "M" that is close to "File" and search in your hard disc your (Tree Image Alpha).jpg image. Don`t forget to activate "invert" and "invert Alpha".

9- In "Maps", click on "m" that is close to "Background" an select:
Type: Bitmap. Go to "M" that is close to "File" and search in your hard disc your (Tree Image Alpha).jpg image. Don`t forget to activate "invert" and "invert Alpha".


10- Remove the refraction channel that vray has added to your image's background.

11- Render!
Sky Dome:

Phisical Sky:

I'm not an expert at VRay so if anyone knows a better way to do it please tell me. I'm sure there are a lot of easyer methods, but i only know this way.
Note: It seems that if you delete your tree image or you move the skp model or the image, it doesn`t work anymore, so you have to keep into the same folder the model and images.
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