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"Marc" <jac### [at] wanadoo fr> wrote:
> web.4638100b40b8ee6c7a9334df0@news.povray.org...
> >I am looking for help on an effect (or maybe it's two effects)
> >
> > 1. I want to create a 3D image which looks like transparencies stacked one
> > on top of the other. Each transparencey will have an image or text on it
> > (via image_map I think). I can use Box{} to simulate the sheet with
> > dimensions of the sheet and z dimension being thickness (i.e. a very thin
> > box). If I put several on top of each other will I need to increase the
> > maxtrace value?
>
> If you use boxes, the rays will cross 2 surfaces per box. Why not use planes
> or pairs of triangles (if you want edges) which have no thickness at all
> beeing single face objects? You certainly will need to increase
> max_trace_level which default value is5.
>
> >
> > 2. Is it possible to determine where on the Box{} the image is placed?
> >
> You can apply transformations to you pigment.
> Here is an exemple of texture :
>
> texture
> {
> pigment
> {
> image_map
> {
> jpeg "You_image.jpg"
> once // image displayed only once, no tiling!
> filter all 1.0 // filter transparency as coloured filter , you
> can use transmit as well (or any mixed amount of both) as a thin fabric
> behaves with light
> }
> translate <-0.2, -0.5, 0.0> // here a translation but you can
> scale and rotate as usual
> }
> finish
> {
> ambient 0.0
> diffuse 0.8 // diffuse value higher than 0.6 default value to keep
> a contrasted image
> }
> }
>
>
> Marc
A) I would have thought the translate operation needed to be within the
brackets for the image_map? (I am not unfamiliar with programming, just
POV-Ray). As written it seems to translate the pigment as opposed to the
image.
B) Won't the image fill the entire plane? Sometimes I want the image to be
only a small part of the "transparency"
But, thanks for the tips - I will try to use some of them and see what
results I get.
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