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Amiga Plus Extra 1996 #6
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programme
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dust
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cdeformtut
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cdeformtut.txt
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1996-03-22
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###############################################################################
# #
# Dust V2.30 - Copyright ©1994 by A.Maschke #
# All rights reserved. #
#-----------------------------------------------------------------------------#
# #
# CDEFORM-Tutorial #
# #
###############################################################################
1. Cone->Prism (simple introduction)
-------------------------------------------------------------------------------
a) create the objects:
Source:
-create a tube (24 circle sections, turn of "stagger points",
turn on "close bottom" and "close top")
-enter the "Pick-faces"-mode
-select the top-faces, create a subgroup "G1"
-select the bottom-faces, create a subgroup "G2"
-save it as "t1"
Destination:
-create a tube (5 circle sections, turn of "stagger points",
turn on "close bottom" and "close top")
-enter the "Pick-faces"-mode
-select the top-faces, create a subgroup "G1"
-select the bottom-faces, create a subgroup "G2"
-save it as "t2"
b) deform the source object
-start Dust
-load the objects
"load(1,t1)" and
"load(2,t2)"
-deform it
"cdeform(1,2,G1,"",0.2)" and
"cdeform(1,2,G2,"",0.2)"
-save it
"save(1,test)"
c) create the metamorphosis
-load the object "t1", create a state "CONE" (Shape).
-load the deformed object "test", select the "t1"-object
and choose "States/Import" to import the state of the deformed
object.
-delete the "test"-object, save your states-object, morph it
2. Head->Bottle (nice effect) (only registered version)
-------------------------------------------------------------------------------
a) define the curves
Source:
-load the supplied object "head", enter the "Pick faces"-mode
-select the the first curve at the top, name it "G1"
(you should have selected 18 faces)
-save it as "head2"
-count the number of curves you want to morph: 33
-let's start Dust to define the curves using the
EXPANDSG-command:
load(1,head2)
;create subgroups G2-G32
for(i,1,31)
expandsg(1,G$,G$(i+1))
end
save(1,head3)
-"head3" contains 32 subgroups (curves), the remaining
is the boundary the whole object
Destination:
-load the supplied object "bottle", enter the "Pick faces"-mode
-select the the first curve at the top, name it "G1"
(you should have selected 20 faces)
-count the number of curves: 8
-let's start Dust to define the curves using the
EXPANDSG-command:
load(1,bottle2)
;create subgroups G2-G8
for(i,1,7)
expandsg(1,G$,G$(i+1))
end
save(1,bottle3)
-"bottle3" contains 8 subgroups (curves)
b) deform the head
Because the destination-oobject has less curves than the
source -object we have to use the CDEFORMINTERP-command.
The bootle has 7 segment. Let's make a list which curves
to move into which segment. E.g., Segment 1 is build by the curves
1 and 2, if you want to move 5 source curves into this segment
you have to use scale-values from 0.2 to 1.0 (step 1/5).
1 -> segment 1 (scale=0.0)
2-6 -> segment 1 (scale=0.2,0.4,0.6,0.8,1.0)
7-10 -> segment 2 (scale=0.25,0.5,0.75,1.0)
11-15 -> segment 3 (scale=0.2,0.4,0.6,0.8,1.0)
16-20 -> segment 4 (scale=0.2,0.4,0.6,0.8,1.0)
21-25 -> segment 5 (scale=0.2,0.4,0.6,0.8,1.0)
26->30 -> segment 6 (scale=0.2,0.4,0.6,0.8,1.0)
31->33 -> segment 7 (scale=0.3333,0.6667,1.0)
A procedure which moves N curves into one segment defined
by the curves destSG1 and destSG2 could look like this:
.srcSG=<start with source-curve>
.destSG1=<segment-curve 1>
.destSG2=<segment-curve 2>
.steps=<N>
for(i,1,steps)
.scale=i*1.0/steps
cdeforminterp(1,2,G$(srcSG),NONE,G$(destSG1),NONE,G$(destSG2),NONE,scale,0.0,G$(srcSG-1),NONE,G$(srcSG-2),NONE)
;if you don't have control-curves:
;cdeforminterp(1,2,G$(srcSG),NONE,G$(destSG1),NONE,G$(destSG2),NONE,scale,0.0)
.srcSG=srcSG+1
end
This procedure uses control-curves for best results.
The script "head->bottle.bat" is the final script deforming the
whole object.
It creates the deformed object test", load this object into Imagine's
Detail-Editor to move one point which doesn't belong to any curve
by hand. This the inner-point of subgroup "G1".
Now remove all subgroups, create a states-object, render it. You will
produce an exciting effect.
(15 September 1995)