Howdy folks,

I'm sure there's a very good reason that "transmit all" works the way that it
does with .png transparency, but it seems like it would be a lot more useful if
the file transparency would just carry over to the image map. Is there some
magical way to do that?

Here's a short demo file. (The image "ABBA.png" has an opaque round center and a
fully transparent border. Any .png file with transparency will do.)

Have a great day everyone!





#version 3.7;

global_settings {assumed_gamma 2.2}

camera {
   orthographic
   location <0, 0, -1>
   right image_width / image_height * x
   direction <0, 0, 1>
   look_at <0, 0, 0>
} //camera

#include "colors.inc"

background {Orange}

#local ImagePigment    = pigment {image_map {png "ABBA.png" gamma 2.2 map_type 0
once transmit all .7}}
#local ImageResolution = max_extent (ImagePigment);

object {
   box {<0, 0, 0> <1, 1, .01>}
   texture {pigment {ImagePigment} finish {emission .9} scale <1, 1.0000001, 1>}
   translate <-.5, -.5, 0>
   scale <1, ImageResolution.y / ImageResolution.x, 1>
} //object

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