PDA

View Full Version : Alpha problem



CBZ
11-03-2004, 10:27 AM
As far as I know this a lightwave problem but maybe it's just I don't know how to handle it. When I try to do an alpha channel I received a rectangular image surrounding the object e.g. a tree. The tree in question is a mapped rectangle. Please, look at the image. The image shows the final render but a rectangle is surrounding the tree, the content of that rectangle is a "not see by camera" image mapped to the object and set by lightwave (I think this behavior it's a consequence of how LW deals with alpha mapped objects). The image shows on top the alpha render and on bottom the actual rgb render, both wrong >:(

Is it possible to avoid that problem?

http://www.dreamimg.com/img/test-img.jpg

Jarno
11-03-2004, 04:27 PM
I'm not sure why you want to have the tree image set to unseen by camera.

But this looks like the classic opaque alpha when using raytrace transparency problem in LW. Either turn off raytrace transparency (if possible with this scene), or download the Alpha Ralpha plugin from our site http://www.tufflittleunit.com/alpharalpha.htm.

---JvdL---

CBZ
11-04-2004, 08:22 AM
I'm not sure why you want to have the tree image set to unseen by camera.

But this looks like the classic opaque alpha when using raytrace transparency problem in LW. Either turn off raytrace transparency (if possible with this scene), or download the Alpha Ralpha plugin from our site http://www.tufflittleunit.com/alpharalpha.htm.

---JvdL---

Thank you very much Jarno.

The plugin works but if no object behind.

I do'n't make the tree image to unseen by camera, the rectangular image surrounding the tree is an unseen object by the camera, is big dome to enhance the glass reflection, I want an extra effect to give a more richier reflections to the glass.

http://www.dreamimg.com/img/ralpha.jpg

The image on top is with alpharalpha plugin but without the dome (object behind)
The image on bottom is with alpharalpha plugin with the dome (object behind)

Again thankyou very much for your time,

best regards,

CarlosB