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- Short: Angled down view of how im_sunii.jpg was done.
- Type: pix/trace
- Uploader: kalb0003@gold.tc.umn.edu
- Author: kalb0003@gold.tc.umn.edu
-
- This shows an exagerated profile of how im_sun.jpg was constructed using
- Imagine and Essence Vol I. The sun itself was a sphere rotated on its X axis
- so that the viewer is looking at the Z end. This gives presents the smoothest
- profile to the camera. The sphere was then textured with 'varyrelrgb', colored
- bright yellow, and set to bright.
-
- The flares were created using a disk (A plane would work just as well) set to
- transparent (255,255,255) with 'cylindturb' applied so that the Z axis was
- perpendicular to the surface of the disk. All settings except size
- (which was adjusted for the corona size) and transparency (which was set to
- 0,0,0) were changed to -1. This turned off coloring and made the disk solid
- only where the texture was applied. The disk was also made bright and a
- slightly diferent shade of yellow.
-
- A second disk was added to create a bright, hazy glare around the sun. This
- was created with the 'radial' texture. The object was again set to bright
- and yellow. The texture had a filter setting of 255,255,255.
-
- Finally, a third black disk was used to block out the stars in the glare.
- Normally the human eye (and just about any camera) can't "see through" the
- glare created by a bright light. This disk was added to create this effect.
-
- Bonuses:
-
- The flares can be animated by morphing two versions of the frist disk; one
- with the texture axis translated along it's Z axis one way, and a second with
- the axis moved the other way. Since most of the Essence textures are
- volumetric, this will work with just about any texture.
-
- Liabilities:
-
- The flares look rather two dimentional if viewed for a long time by an educated
- observer (i.e. you know how the effect works).
-
- The surface of the sun could use a better texture. Impulses Scott Kirvan
- created a great surface with the 'Fireball' and 'Nebula' textures, however I
- almost immediately lost the instructions.
-
- Ideas:
-
- Other textures may be applied to create more detail in the flares. The only
- restriction is the order in which the textures are applied.
-
- When using this idea in an animation, always create the sun-sphere as one
- object, and the three disks as a sparate grouped object. Then rotate the axis
- of the parent object (remember to re-align the texture axis) so the Y is
- perpendicular to the disk. This allows you to track the corona-group to the
- camera so you will always have a head on view (try this, along with morphing the
- flares, in a fly by...).
-
- If you have any questions, comments or ideas, feel free to mail me.
-
- If you make any improvements DEFINATELY contact me. I want to know how you
- did it and why (it's only fair...).
-
- Good luck and happy rendering!