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- Newsgroups: comp.sys.amiga.graphics
- Path: sparky!uunet!cs.utexas.edu!sun-barr!ames!agate!rsoft!mindlink!a4482
- From: Jeff_Holinski@mindlink.bc.ca (Jeff Holinski)
- Subject: Re: Imagine 2.0: Bad graphic quality??!
- Organization: MIND LINK! - British Columbia, Canada
- Date: Mon, 23 Nov 1992 02:28:33 GMT
- Message-ID: <17677@mindlink.bc.ca>
- Sender: news@deep.rsoft.bc.ca (Usenet)
- Lines: 53
-
-
- The reason your sandstone won't stay still is that the roughness you're using
- is a random thing. It randomly dithers the mountain to make it look rough.
- To get roughness that will animate try this:
- 1: make a plane and set it to maximum roughness.
- 2: render an image of it looking straight down on it from above with a light
- source to one side.
- 3: The image you get will be suitable for an altitiude map. Basicly you want
- a full screen image of randomly dithered greyscales. You might be able to get
- suitable results from DPaint's airbrush.
- 4: Select your mountain and go into the attribute window and select brush and
- set the map type as an altitude map. Also select mirror and repeat.
- 5: Save the object and test render it.
- 6: Roughness on the mountain should be set at 0 before it's saved.
-
- Since the object's roughness is now handled by an altitude map instead of
- randomly you should be able to animate it properly now.
- A couple of other things to try for better renderings are:
- Set you quickrender to quarter-screen ham. You'll be able to see your test
- renderings sooner and will waste less time on stuff that don't work.
- Try to make your objects 500 units or larger. Imagine has a bit of a problem
- with real small objects.
- Lighting is the biggest problem Imagine has. A few tips are:
- Indoor scenes should be lit with diminishing lights. If you don't use
- diminsihing lights the scene won't look right. Lights can be set at up to
- 32000 on red, green, and blue. You won't use values that high but you will
- often have to get up into the over 255 range. When you change the size of an
- object you will also change the way it's lit. For example: You build a
- kitchen and manage to get all the lighting set up so it looks OK. You realize
- you have to enlarge the object to make it fit the rest of the house. You
- kitchen would now be too dark because the light has to travel further to
- illuminate any surfaces. You'll have to do a lot of test renderings to get
- decent results.
-
- Problems with full traces:
- If you lose parts of objects in full trace mode you should go into the Action
- Editor and all a size bar to the globals. Set the xyz sizes at 0. This will
- auto-size the Imagine universe for each frame it renders.
-
- If your scanline renderings come out OK but your images are really dark in
- full trace you probably have your lights inside objects. (lightbulbs, candle
- flames, ect) The problem is that the surface of your lightbulb is not letting
- the light through unless you set the transparency to maximum which doesn't
- look real. The best solution I've found it to move the light outside of the
- object and make sure the object's not too close to a wall so you can't tell
- exactly where the light comes from.
-
- Hope this advice helps you get a little better results. If you don't have it
- already you should also get 'Understanding Imagine 2.0' by Steve Worley. It's
- an excellent reference book that has a lot of information that's not in the
- Imagine manual.
-
-
-