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- I have just downloaded the lens flare object from Aminet
- (gfx/3dobj/Flare.lha). This object have been created by Cryto with the
- technics given in the Amazing Computing article (Feb94). It looks ok,
- but it is not the lens flare I was expecting, so I made some
- modifications to make is useable in an animation.
-
- In a lens flare, the rings are following a line that point to the light
- source and pass thru the center of the screen (just watch a Gun's and
- Roses video, there are more of thoses artifacts than in a LightWave
- animation!).
-
- The first thing I made was deleting the two rings in the object. Then,
- I created an object that consist of disks of different sizes. Each of
- those disks have a radial texture so they are fully transparent at the
- center and semi-transparent on the edge, with a pale blue-purple color.
- Those disks are then placed on a line that follow the Y axis:
-
- Top View:
-
-
-
- ----------------------
-
- ----
-
- ----------------
-
- y
- |
- +-x <---- parent Axis
- ---------------------
-
-
- --------
-
-
- ----------------
- Y
- |
- +- X
-
- Note: All disks X and Z cordinates are identical.
-
- Now, I added an axis in the center and grouped all the disks to that
- axis. For the Lightsource, I added an axis far in front of the star
- object and made it the parent with it's Y axis pointing in the direction
- of the star.
-
- In the anim, the star object is placed in all frame in the same position
- as the camera with tracking on the light source. The camera track the
- disks object and the disk object track the light source. Make sure that
- the star and rings are in front of every other object in all frames.
-
- Et voila: Animated lens flare. The light source may move normaly. If
- the camera move, the rings object must always be kept at the same
- distance from the camera. To change alignement of the camera, you have
- to move the rings object.
-
- I will upload some images (jpeg) from an animation with the staging and
- all the objects to aminet soon. Watch for AnimFlare.lha. The animation
- show a sunset from space where the rings fade in and out as the light
- come closer to the center of the screen and the star disapear behind the
- planet. You will also get, as a free gift, an object of the planet
- Mars.
-
-
-
- Patrick Sauvageau
- sauvp00@dmi.usherb.ca
-
- (Please forgive my bad english; it's not my native language)
-
-