Rainbows by numbers

These operations were carried out on the PC Windows version of Bryce 3D.

For Bryce 5 Rainbows see note at the bottom of this page.

Interface

Choose a sky preset. I chose the second of the presets called Midsummer afternoon. Check that the haze value is about 70. Drag on the cloud height to the right until the value is 100.

Click on the Edit Sky/Fog downward pointing triangle. Click on the Atmosphere Tab check the rainbow option and increase the Opacity to 100. Click on the Sun and Moon tab. At the bottom you will see Numeric Sun Values.

In the first three of these Numeric Sun Values labelled X,Y and Z enter the values shown opposite. Increasing values of Y lower the rainbow towards the horizon. X and Z remain at 0 and -90 respectively.

To move the rainbow to the right enter increasing negative values for X.

To move the rainbow to the left enter increasing positive values for X.

By using combinations of these numbers you can position the rainbow to your liking. Having positioned it you can try reducing the cloud height and notice that at zero you can't see your rainbow. Reduce the haze value and notice at zero you can't see the rainbow. Experiment with the Opacity of the rainbow and with the Radius which actually varies the width. Also note that if you change the sky preset the rainbow option becomes unchecked and so the rainbow disappears.

Bryce 5 Rainbows!

Select Sky & Fog then Skylab.
Select the Atmosphere tab.
Activate rainbow.
Set Radius to 50 (This is actually the width of the bow not the radius)
Opacity to 100 (this makes sure you can see it - reduce haze if you can't)
Azimuth to 180 (adjust + or - about 180)
Altitude to 30 (adjust higher or lower in small amounts)

Have fun.....