topic Material texture definition and alpha-channel transparency in Libraries & objects

Material texture definition and alpha-channel transparency

Pertti Paasky — Wed, 11 Feb 2015 15:35:39 GMT

Hi there!
I tried to make tree objects that include their bitmaps using a code like in the AC 18 library tree object:

DEFINE TEXTURE "TextureTree3D" 1, A, B, 1, 0
DEFINE MATERIAL "TreeMat3D" 20,
0, 0, 0,
0.58, 0.85, 0.2, valueOpacity,
50,
0,
0.878401, 0.513481, 0.412253,
0, 0, 0,
0,
ind(fill, "emptyFill"), 1,
ind(texture, "TextureTree3D")

The pictures are saved in the object and the code refers them by number
(DEFINE TEXTURE "TextureTree3D" 1, A, B, 1, 0)

So I saved a .png bitmap with alpha channel as an object and added this code. It worked but the alpha channel transparency was not found.

Did I miss something? Or is there a special way to save pictures in objects for this purpose? (ref. GDL manual page 213)

I think it is convinient to save bitmaps together with objects, but they need to be transparent.

Re: Material texture definition and alpha-channel transparen

Anonymous — Thu, 12 Feb 2015 17:57:38 GMT

Hello,

Have you tried;

PICTURE name, a, b, mask

It has a transparency mask.

Can't test right now, but possibly allows
picture index instead of the name string.

Re: Material texture definition and alpha-channel transparen

Pertti Paasky — Thu, 12 Feb 2015 20:33:15 GMT

Hi Juha!
It is necessary to have polygons, not a picture because I want to export the 3d model to other programs like Renderlights. Picture has no polygons...
There are also other problems: if you define more than one material there is a change that you get no textures. In that case changing the names of the materials brings textures back to life. Anyway GS tree object seems to work fine, also .skp export is doing fine. But when I use self-coded materials , the export fails.