Set Object Transparency -- Set Alpha Mapping On breaks when texturing more than 1 stage.

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KISTech

16

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Joined: 8th Feb 2008

Location: Aloha, Oregon

Posted: 12th Jun 2010 19:28

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Setup : The ball in the demo is supposed to start out RED and change to BLUE. If only one texture stage is textured, it works. When a second stage is also textured, it no longer works. (uncomment the 2 lines indicated in the code to texture the second stage)

Possible Cause : It seems to be unclear whether this has to do with a specific version of DBP or whether or not it may be hardware related. One person in the thread I opened to discuss this problem was able to run it without issue whether the second stage was textured or not. My video card is NVidia, theirs is ATI.

http://forum.thegamecreators.com/?m=forum_view&t=171248&b=1

sync on : sync rate 30

make object sphere 1, 20
make object sphere 2, 20

create bitmap 1, 64, 64
cls rgb(255,0,0)
red = 1
get image red, 0, 0, 64, 64
cls rgb(0, 0, 255)
blue = 2
get image blue, 0, 0, 64, 64
cls rgb(128,128,128)
grey = 3
get image grey, 0, 0, 64, 64
delete bitmap 1

texture object 1, 0 ` Clear all texture stages
texture object 2, 0

set blend mapping on 1, 0, 1, 3, 4 ` Put our Red image on stage 0 of object 1
set blend mapping on 2, 0, 2, 3, 4 ` Put our Blue image on stage 0 of object 2

` Comment out these 2 lines, and it works.
` Leave them uncommented and it breaks SET OBJECT TRANSPARENCY
set blend mapping on 1, 1, 3, 3, 22 ` Flat bumpmap applied to stage 1
set blend mapping on 2, 1, 3, 3, 22 ` Flat bumpmap applied to stage 1

set object transparency 1, 0
set object transparency 2, 0

set alpha mapping on 1, 100
set alpha mapping on 2, 0

direction# = 0.25

while not escapekey()

text 10, 10, str$(x#,0)
	text 10, 30, str$(y#,0)

inc x#, direction#
	if x# >= 100 then direction# = -0.25
	if x# <= 0 then direction# = 0.25
	y# = 100 - x#
	set alpha mapping on 1, y#
	set alpha mapping on 2, x#
	
	sync
endwhile

+ Code Snippet

sync on : sync rate 30

make object sphere 1, 20
make object sphere 2, 20

create bitmap 1, 64, 64
cls rgb(255,0,0)
red = 1
get image red, 0, 0, 64, 64
cls rgb(0, 0, 255)
blue = 2
get image blue, 0, 0, 64, 64
cls rgb(128,128,128)
grey = 3
get image grey, 0, 0, 64, 64
delete bitmap 1

texture object 1, 0 ` Clear all texture stages
texture object 2, 0

set blend mapping on 1, 0, 1, 3, 4 ` Put our Red image on stage 0 of object 1
set blend mapping on 2, 0, 2, 3, 4 ` Put our Blue image on stage 0 of object 2

` Comment out these 2 lines, and it works.
` Leave them uncommented and it breaks SET OBJECT TRANSPARENCY
set blend mapping on 1, 1, 3, 3, 22 ` Flat bumpmap applied to stage 1
set blend mapping on 2, 1, 3, 3, 22 ` Flat bumpmap applied to stage 1

set object transparency 1, 0
set object transparency 2, 0

set alpha mapping on 1, 100
set alpha mapping on 2, 0

direction# = 0.25

while not escapekey()

	text 10, 10, str$(x#,0)
	text 10, 30, str$(y#,0)

	inc x#, direction#
	if x# >= 100 then direction# = -0.25
	if x# <= 0 then direction# = 0.25
	y# = 100 - x#
	set alpha mapping on 1, y#
	set alpha mapping on 2, x#
	
	sync
endwhile

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GeeBee

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Joined: 26th Aug 2008

Location:

Posted: 8th Nov 2010 18:44

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Any sentencing on this possible bug yet?

I appear to be meeting a variation of the same issue when attemping to transition between a .dbo model with a lightmap applied (problem: tree texture .png alpha goes solid black) and a .x with a single texture (works fine, same .png texture).

It would be useful to know if I would be wasting my time trying to figure out if the problem is at 'my end'.

Habits can get you into trouble sometimes (unless you are a nun....)

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Green Gandalf

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Years of Service

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Joined: 3rd Jan 2005

Playing: Malevolence:Sword of Ahkranox, Skyrim, Civ6.

Posted: 8th Nov 2010 20:40

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I don't know whether this helps locate the source of the problem.

Try this variation of KISTech's code. This suggests to me that the alpha mapping command might be using blend stage 1 for the alpha mapping. Lee should know the answer.

sync on : sync rate 30

color backdrop 0

make object sphere 1, 20
position object 1, -5, 0, 0
make object sphere 2, 20
position object 2, 5, 0, 0

create bitmap 1, 64, 64
cls rgb(255,0,0)
red = 1
get image red, 0, 0, 64, 64
cls rgb(0, 0, 255)
blue = 2
get image blue, 0, 0, 64, 64
cls rgb(64,64,64)            ` try changing this to different shades of grey and see what happens
grey = 3
get image grey, 0, 0, 64, 64
delete bitmap 1

texture object 1, 0 ` Clear all texture stages
texture object 2, 0

set blend mapping on 1, 0, 1, 3, 4 ` Put our Red image on stage 0 of object 1
set blend mapping on 2, 0, 2, 3, 4 ` Put our Blue image on stage 0 of object 2

` Comment out these 2 lines, and it works.
` Leave them uncommented and it breaks SET OBJECT TRANSPARENCY
set blend mapping on 1, 1, 3, 3, 22 ` Flat bumpmap applied to stage 1
set blend mapping on 2, 1, 3, 3, 22 ` Flat bumpmap applied to stage 1

set object transparency 1, 0
set object transparency 2, 0

set alpha mapping on 1, 100
set alpha mapping on 2, 0

direction# = 0.25
x# = 50

while not escapekey()

text 10, 10, str$(x#,0)
  text 10, 30, str$(y#,0)

inc x#, direction#
  if x# >= 100 then direction# = -0.25
  if x# <= 0 then direction# = 0.25
  y# = 100 - x#
  set alpha mapping on 1, y#
  set alpha mapping on 2, x#
  
  sync
endwhile

+ Code Snippet

sync on : sync rate 30

color backdrop 0

make object sphere 1, 20
position object 1, -5, 0, 0
make object sphere 2, 20
position object 2, 5, 0, 0

create bitmap 1, 64, 64
cls rgb(255,0,0)
red = 1
get image red, 0, 0, 64, 64
cls rgb(0, 0, 255)
blue = 2
get image blue, 0, 0, 64, 64
cls rgb(64,64,64)            ` try changing this to different shades of grey and see what happens
grey = 3
get image grey, 0, 0, 64, 64
delete bitmap 1

texture object 1, 0 ` Clear all texture stages
texture object 2, 0

set blend mapping on 1, 0, 1, 3, 4 ` Put our Red image on stage 0 of object 1
set blend mapping on 2, 0, 2, 3, 4 ` Put our Blue image on stage 0 of object 2

` Comment out these 2 lines, and it works.
` Leave them uncommented and it breaks SET OBJECT TRANSPARENCY
set blend mapping on 1, 1, 3, 3, 22 ` Flat bumpmap applied to stage 1
set blend mapping on 2, 1, 3, 3, 22 ` Flat bumpmap applied to stage 1

set object transparency 1, 0
set object transparency 2, 0

set alpha mapping on 1, 100
set alpha mapping on 2, 0

direction# = 0.25
x# = 50

while not escapekey()

  text 10, 10, str$(x#,0)
  text 10, 30, str$(y#,0)

  inc x#, direction#
  if x# >= 100 then direction# = -0.25
  if x# <= 0 then direction# = 0.25
  y# = 100 - x#
  set alpha mapping on 1, y#
  set alpha mapping on 2, x#
  
  sync
endwhile

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KISTech

16

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Joined: 8th Feb 2008

Location: Aloha, Oregon

Posted: 13th Jan 2011 18:17

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I also noticed that the Red sphere remains intact when the Blue sphere fades, but the part of the Blue sphere that intersects the Red sphere doesn't become visible until the Red sphere is completely invisible.

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Bug Reports / Set Object Transparency -- Set Alpha Mapping On breaks when texturing more than 1 stage.