Strange Rendering when trying to get an object to show up behind another

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Golelorn

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Posted: 13th Sep 2018 18:11

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Hey guys,

I have my player setup with different meshes. I am wondering if that is the cause of this strange see through effect, and do I need to make the character all one mesh? Or something else? Thanks for any guidance.

function render_area()
	Update(0)
	SetRenderToScreen()
	Render2DBack()
	RenderShadowMap()
	Render3D()
	SetObjectDepthReadMode( game.player.objID, 4 )
	if GetObjectExists( game.player.hhright ) then SetObjectDepthReadMode( game.player.hhright, 4 )
	if GetObjectExists( game.player.hhleft ) then SetObjectDepthReadMode( game.player.hhleft, 4 )
	SetObjectColor( game.player.objID, 55, 85, 120, 255 )
	if GetObjectExists( game.player.hhright ) then SetObjectColor( game.player.hhright, 55, 85, 120, 255 )
	if GetObjectExists( game.player.hhleft ) then SetObjectColor( game.player.hhleft, 55, 85, 120, 255 )
	DrawObject( game.player.objID )
	if GetObjectExists( game.player.hhright ) then DrawObject( game.player.hhright )
	if GetObjectExists( game.player.hhleft ) then DrawObject( game.player.hhleft )
	SetObjectColor( game.player.objID, 255, 255, 255, 255 )
	if GetObjectExists( game.player.hhright ) then SetObjectColor( game.player.hhright, 255, 255, 255, 255 )
	if GetObjectExists( game.player.hhleft ) then SetObjectColor( game.player.hhleft, 255, 255, 255, 255 )
	SetObjectDepthReadMode( game.player.objID, 3 )
	if GetObjectExists( game.player.hhright ) then SetObjectDepthReadMode( game.player.hhright, 3 )
	if GetObjectExists( game.player.hhleft ) then SetObjectDepthReadMode( game.player.hhleft, 3 )
	Render2DFront()
	Swap()
endfunction

+ Code Snippet

function render_area()
	Update(0)
	SetRenderToScreen()
	Render2DBack()
	RenderShadowMap()
	Render3D()
	SetObjectDepthReadMode( game.player.objID, 4 )
	if GetObjectExists( game.player.hhright ) then SetObjectDepthReadMode( game.player.hhright, 4 )
	if GetObjectExists( game.player.hhleft ) then SetObjectDepthReadMode( game.player.hhleft, 4 )
	SetObjectColor( game.player.objID, 55, 85, 120, 255 )
	if GetObjectExists( game.player.hhright ) then SetObjectColor( game.player.hhright, 55, 85, 120, 255 )
	if GetObjectExists( game.player.hhleft ) then SetObjectColor( game.player.hhleft, 55, 85, 120, 255 )
	DrawObject( game.player.objID )
	if GetObjectExists( game.player.hhright ) then DrawObject( game.player.hhright )
	if GetObjectExists( game.player.hhleft ) then DrawObject( game.player.hhleft )
	SetObjectColor( game.player.objID, 255, 255, 255, 255 )
	if GetObjectExists( game.player.hhright ) then SetObjectColor( game.player.hhright, 255, 255, 255, 255 )
	if GetObjectExists( game.player.hhleft ) then SetObjectColor( game.player.hhleft, 255, 255, 255, 255 )
	SetObjectDepthReadMode( game.player.objID, 3 )
	if GetObjectExists( game.player.hhright ) then SetObjectDepthReadMode( game.player.hhright, 3 )
	if GetObjectExists( game.player.hhleft ) then SetObjectDepthReadMode( game.player.hhleft, 3 )
	Render2DFront()
	Swap()
endfunction

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GarBenjamin

AGK Developer

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Joined: 30th Nov 2016

Location: USA

Posted: 13th Sep 2018 18:40

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Don't have an answer but my first impression was that's an awesome fx for making the character stand out when going in foliage and behind objects. Looks intentionally done.

My Projects Most With Full Source...
[Attack of the Crows] [Christmas Command 2016]
[Simple Sprite Shaders Example] [Old School Style 3D FPS]
[Playable 2D Shmup Template] [2D Single Screen Platformer]
[FixSpriteToSprite System & Demo]
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puzzler2018

User Banned

Posted: 13th Sep 2018 18:45 Edited at: 13th Sep 2018 18:46

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Maybe

SetObjectTransparency(object,0) - to turn off transparency of an object

SetObjectTransparency(object,1) - to turn on transparency of an object

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Golelorn

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Joined: 20th Nov 2016

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Posted: 13th Sep 2018 18:59 Edited at: 13th Sep 2018 19:13

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Gar, it is intentionally done. But, you can see through the character to the other side when he is not behind anything.

Changing the transparency only makes the silhouette darker or lighter.

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GarBenjamin

AGK Developer

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Joined: 30th Nov 2016

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Posted: 13th Sep 2018 19:12 Edited at: 13th Sep 2018 19:12

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Oh yes I can see it now. Sorry about that. Before I was on my cell phone and didn't notice. Am on lunch break on my laptop now and can see it very clearly the characters arm on the other side can be seen right through his body.

My Projects Most With Full Source...
[Attack of the Crows] [Christmas Command 2016]
[Simple Sprite Shaders Example] [Old School Style 3D FPS]
[Playable 2D Shmup Template] [2D Single Screen Platformer]
[FixSpriteToSprite System & Demo]
[Mutant Invaders 3D Shmup] [Unity - Atlantic Crisis]
[Unity - Treasures of Ali-Gar] [My YouTube Videos] [Twitter]
[AppGameKit BASIC Extended API]

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Bengismo

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Joined: 20th Nov 2017

Location: Yorkshire, England

Posted: 13th Sep 2018 19:35 Edited at: 13th Sep 2018 19:41

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Its because you set the depth read mode to 4 then you draw your character

+ Code Snippet

SetObjectDepthReadMode( game.player.objID, 4 )
if GetObjectExists( game.player.hhright ) then SetObjectDepthReadMode( game.player.hhright, 4 )
if GetObjectExists( game.player.hhleft ) then SetObjectDepthReadMode( game.player.hhleft, 4 )

Mode 4 draws things that are further away on top of things that are closer (its the reverse of the normal render mode) ....so on the drawing of your character the arms are drawn on top of the torso even though they are behind the torso. Depth is reversed. This occurs whether he is behind a tree or not in the video.

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Golelorn

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Posted: 13th Sep 2018 20:22 Edited at: 13th Sep 2018 20:23

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Ah...

It was combination of of what you said Bengismo and what Puzzler said about transparency. Still can see his arms when he is in the trees, but for now I can live with that. Thank you!

function render_area()
	Update(0)
	SetRenderToScreen()
	Render2DBack()
	RenderShadowMap()
	SetObjectVisible( game.player.objID, 0 )
	Render3D()
	SetObjectVisible( game.player.objID, 1 )
	
	SetObjectTransparency( game.player.objID, 2 )
	if GetObjectExists( game.player.hhright ) then SetObjectTransparency( game.player.hhright, 2 )
	if GetObjectExists( game.player.hhleft ) then SetObjectTransparency( game.player.hhleft, 2 )
	
	SetObjectDepthWrite( game.player.objID, 0 )
	SetObjectDepthReadMode( game.player.objID, 4 )
	if GetObjectExists( game.player.hhright ) then SetObjectDepthReadMode( game.player.hhright, 4 )
	if GetObjectExists( game.player.hhleft ) then SetObjectDepthReadMode( game.player.hhleft, 4 )
	SetObjectColor( game.player.objID, 100, 100, 150, 255 )
	if GetObjectExists( game.player.hhright ) then SetObjectColor( game.player.hhright, 100, 100, 150, 255 )
	if GetObjectExists( game.player.hhleft ) then SetObjectColor( game.player.hhleft, 100, 100, 150, 255 )
	DrawObject( game.player.objID )
	if GetObjectExists( game.player.hhright ) then DrawObject( game.player.hhright )
	if GetObjectExists( game.player.hhleft ) then DrawObject( game.player.hhleft )
	SetObjectColor( game.player.objID, 255, 255, 255, 255 )
	if GetObjectExists( game.player.hhright ) then SetObjectColor( game.player.hhright, 255, 255, 255, 255 )
	if GetObjectExists( game.player.hhleft ) then SetObjectColor( game.player.hhleft, 255, 255, 255, 255 )
	
	SetObjectDepthReadMode( game.player.objID, 1 )
	if GetObjectExists( game.player.hhright ) then SetObjectDepthReadMode( game.player.hhright, 1 )
	if GetObjectExists( game.player.hhleft ) then SetObjectDepthReadMode( game.player.hhleft, 1 )
	SetObjectTransparency( game.player.objID, 0 )
	
	if GetObjectExists( game.player.hhright ) then SetObjectTransparency( game.player.hhright, 1 )
	if GetObjectExists( game.player.hhleft ) then SetObjectTransparency( game.player.hhleft, 1 )
	DrawObject( game.player.objID )
	
	Render2DFront()
	Swap()
endfunction

+ Code Snippet

function render_area()
	Update(0)
	SetRenderToScreen()
	Render2DBack()
	RenderShadowMap()
	SetObjectVisible( game.player.objID, 0 )
	Render3D()
	SetObjectVisible( game.player.objID, 1 )
	
	SetObjectTransparency( game.player.objID, 2 )
	if GetObjectExists( game.player.hhright ) then SetObjectTransparency( game.player.hhright, 2 )
	if GetObjectExists( game.player.hhleft ) then SetObjectTransparency( game.player.hhleft, 2 )
	
	SetObjectDepthWrite( game.player.objID, 0 )
	SetObjectDepthReadMode( game.player.objID, 4 )
	if GetObjectExists( game.player.hhright ) then SetObjectDepthReadMode( game.player.hhright, 4 )
	if GetObjectExists( game.player.hhleft ) then SetObjectDepthReadMode( game.player.hhleft, 4 )
	SetObjectColor( game.player.objID, 100, 100, 150, 255 )
	if GetObjectExists( game.player.hhright ) then SetObjectColor( game.player.hhright, 100, 100, 150, 255 )
	if GetObjectExists( game.player.hhleft ) then SetObjectColor( game.player.hhleft, 100, 100, 150, 255 )
	DrawObject( game.player.objID )
	if GetObjectExists( game.player.hhright ) then DrawObject( game.player.hhright )
	if GetObjectExists( game.player.hhleft ) then DrawObject( game.player.hhleft )
	SetObjectColor( game.player.objID, 255, 255, 255, 255 )
	if GetObjectExists( game.player.hhright ) then SetObjectColor( game.player.hhright, 255, 255, 255, 255 )
	if GetObjectExists( game.player.hhleft ) then SetObjectColor( game.player.hhleft, 255, 255, 255, 255 )
	
	SetObjectDepthReadMode( game.player.objID, 1 )
	if GetObjectExists( game.player.hhright ) then SetObjectDepthReadMode( game.player.hhright, 1 )
	if GetObjectExists( game.player.hhleft ) then SetObjectDepthReadMode( game.player.hhleft, 1 )
	SetObjectTransparency( game.player.objID, 0 )
	
	if GetObjectExists( game.player.hhright ) then SetObjectTransparency( game.player.hhright, 1 )
	if GetObjectExists( game.player.hhleft ) then SetObjectTransparency( game.player.hhleft, 1 )
	DrawObject( game.player.objID )
	
	Render2DFront()
	Swap()
endfunction

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puzzler2018

User Banned

Posted: 13th Sep 2018 20:51 Edited at: 13th Sep 2018 20:54

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In reality - should you be able to see objects that are walking behind other objects. There must be a reason for this behaviour - still its worth looking deeply at instead of brushing it off
as it would help others if anyone else get this

You need your character to just not be displayed if walking behind an object then maybe look at culling techniques too maybe

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Golelorn

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Joined: 20th Nov 2016

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Posted: 13th Sep 2018 22:16

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I wanted it to be displayed. Like in most games when the character walks behind a tree. I want a silhouette to appear.

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puzzler2018

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Posted: 13th Sep 2018 22:48

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ok - i can work with that

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Golelorn

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Joined: 20th Nov 2016

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Posted: 16th Sep 2018 21:24

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Interesting side effect.

If an object uses SetObjectTransparency( obj, 1) then the player will always be in front of the object. However, if you use SetObjectAlphaMask( obj, 1) then the player's silhouette will be behind the object.

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