Using 'set object transparency' draws only to camera 0

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Broken_Code

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Posted: 18th Nov 2013 11:50

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Hello!

I'm using bond1's Bloom shader, with camera 1 as my Bloom camera and camera 0 as my Screen camera.

When I use set object transparency that object appears only on camera 0 (unless I set the object mask to not appear on cam 0, in which case it doesn't appear at all!), if don't use set object transparency then that object appears on all cameras as expected.

Anyone know anything about this?

Thanks,
Bruce

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Rudolpho

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Posted: 18th Nov 2013 22:35

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I know for a fact that transparency works just well with camera 1, thus it is likely it should work with any camera.
Does the entire object disappear for your secondary camera?
If so, have you checked its normals / turned backface culling off for it?

"Why do programmers get Halloween and Christmas mixed up?"

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Because Oct(31) = Dec(25)

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Sph!nx

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Posted: 19th Nov 2013 13:57

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I'm not really that familiar with multiple cameras, but perhaps you should set the current camera when drawing to that specific camera?

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SET CURRENT CAMERA <camera>

Regards Sph!nx
www.mental-image.net

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Broken_Code

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Posted: 19th Nov 2013 21:23 Edited at: 19th Nov 2013 21:24

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Thanks for the responses, I found the root of the problem:
I was applying the set object transparency function after cloning the object from a pre-loaded object. When I applied set object transparency to the parent object before cloning a new object from it then it worked fine.

I thought that clone object copied and pasted the object into a new object ID? It seems that there are either some bugs with the function or it dosen't work as I thought.

Is this a bug or have I mis-understood what clone object does?

Thanks,
Bruce

Burning Feet Man - "... Why the hell did I chose game creation as a hobby!? "

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SamKM

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Posted: 19th Nov 2013 22:18

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I think clone object creates a totally new object, using the original object as a base. So only changes you made to it before cloning it would have any effect on the new object

Maybe you're thinking of instance object? That's like clone object, but all clones are dependent on their original object for things like vertex information, texture, etc. I'm still not sure if it has any effect on instanced objects if you adjust the original object after instancing them, though... I guess it would in theory, but probably safer to just put stuff before instance object/clone object

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Green Gandalf

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Posted: 19th Nov 2013 23:10

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Nope. I'm sure Broken_Code is correct - clone object should be a quick way of creating a new object which you can then modify in the usual way.

Sounds like we need a short, emphasise short, compilable and runnable snippet which we can test.

I smell the blood of a bug ...

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Rudolpho

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Posted: 19th Nov 2013 23:39

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Quote: "Nope. I'm sure Broken_Code is correct - clone object should be a quick way of creating a new object which you can then modify in the usual way."

Yes;

Quote: "I was applying the set object transparency function after cloning the object from a pre-loaded object."

It is slightly unclear whether he applied the function to the new clone object or the source one. If he activated transparency for the source object after creating the clones, the clones would obviously not share that setting. However if it doesn't work to set specifically for a cloned object then yes, that sounds like a bug.

"Why do programmers get Halloween and Christmas mixed up?"

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Because Oct(31) = Dec(25)

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Green Gandalf

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Posted: 20th Nov 2013 00:36

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Yes, hence my request:

Quote: "Sounds like we need a short, emphasise short, compilable and runnable snippet which we can test."

I emphasise short, compilable and runnable. It continually amazes me how people expect us to fill in all the essential missing gaps from a small extract of a much larger program. Quite often the simple task of producing a short snippet exhibiting the symptoms will highlight the problem in itself.

But let's wait and see.

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Broken_Code

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Posted: 20th Nov 2013 08:19 Edited at: 20th Nov 2013 08:22

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Quote: "It is slightly unclear whether he applied the function to the new clone object or the source one. If he activated transparency for the source object after creating the clones, the clones would obviously not share that setting. However if it doesn't work to set specifically for a cloned object then yes, that sounds like a bug."

I was applying set object transparency to the new object not the base object.

Quote: "It continually amazes me how people expect us to fill in all the essential missing gaps from a small extract of a much larger program."

I didn't, in fact what I expected was "No, that's just how that function works but it's not mentioned in the help", because that's the answer to most of These kinds of Problems!

Quote: " emphasise short, compilable and runnable."

I'll see if I can knock-up a demo later today.

"... Why the hell did I chose game creation as a hobby!?" - Burning Feet Man

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Broken_Code

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Posted: 20th Nov 2013 10:04

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Hm. I made an example of this (Texture in download):

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//Set object transparency example


//Standard setup
ScreenX=800 : ScreenY=600
Set Window on : Set Window position 200,200
Set Display Mode ScreenX,ScreenY,32
Autocam Off
Sync On : Sync Rate 30 : sync

//Load a tex. with alpha
iTex=1
Load Image "Test_Tex.png",iTex //This tex is attached to the post!

//Make an object to clone
iObjBase=1
Make Object cube iObjBase,10
Texture Object iObjBase,iTex
//set object transparency iObjBase,2
Position Object iObjBase,-15,0,0

//Clone object
iObjClone=2
Clone Object iObjClone,iObjBase
set object transparency iObjClone,2
Position Object iObjClone,15,0,0

//Setup cameras
Set Camera View 0,0,0,(ScreenX/2),ScreenY
Position Camera 0,75,25,50 : Point Camera 0,0,0,0
Make Camera 1
Set Camera View 1,(ScreenX/2),0,ScreenX,ScreenY
Position Camera 1,-75,25,50 : Point Camera 1,0,0,0

//Loop
do
    //Spin objects
    inc ang,1    
    Yrotate Object iObjBase,ang
    Yrotate Object iObjClone,-1*ang
    //Sync cameras
    sync
Loop

but as you can see it works perfectly.

This is now even more confusing. I'll try and make an example when I get home this evening with bond1's shader and see if I can replicate it then.

"... Why the hell did I chose game creation as a hobby!?" - Burning Feet Man

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Green Gandalf

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Posted: 20th Nov 2013 11:43

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Quote: "I didn't, in fact what I expected was "No, that's just how that function works but it's not mentioned in the help", because that's the answer to most of These kinds of Problems!"

Fair comment.

Quote: "but as you can see it works perfectly."

Sounds like you're homing in on the crucial point now.

Quote: "I'll try and make an example when I get home this evening with bond1's shader and see if I can replicate it then."

Looking forward to that.

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DarkBASIC Professional Discussion / Using 'set object transparency' draws only to camera 0

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