fading animated objects - GameCreators Forum

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Nabz_32x

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Posted: 14th Aug 2013 22:37

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Hello, since I posted this accidently in the dark Basic Forums and no mod deleted, or moved my post as requested,

I thought it would be my turn to post this up again in the proper Forum.

My Problem is, for my Reggie game I wanted to Highlight enemys when the Player is above them, so the Player can see in advance if he is able to hit the enemy.

However I tried to use the FADE OBJECT command to brighten the enemy objects and it only seems to work on modells which aren´t animated (could also be untextured, because the object it works on is both ).

Is there a solution to this?

If not I will have to add a 3d plain showing up underneath the enemy when the Player is above the enemy.
I really like to use a changed brightness of the object for that, so can someone please tell me if it is possible to fade animated or textured objects ?

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Sixty Squares

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Posted: 16th Aug 2013 04:27 Edited at: 16th Aug 2013 04:33

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That's strange. I don't know much about 3D modelling so I can't help with any problems your models may have, but you could try using set object ambient obj,0 and set object light obj,0 to brighten them. Those commands basically make the object ignore the effects of ambient and external lights on them, so they won't be darkened by anything.

Alternately you could write a shader to do it.

Hmm. It's been a while

.

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MrValentine

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Posted: 16th Aug 2013 08:10

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Quote: "
Ghost Object
Set Object Transparency
Fade Object
"

Have you looked at these yet?

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Nabz_32x

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Posted: 16th Aug 2013 12:53

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Quote: "
[quote] Ghost Object
Set Object Transparency
Fade Object
"

Have you looked at these yet?
[/Quote]

Yes I use them a lot on my landscape, fade object allways works nice for DB Pro generated triangles.

[/quote]
set object ambient obj,0 and set object light obj,0
[Quote]

Thanks, this works to bright the models up. For making These darker however, i guess i Need a shader for that then.

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Green Gandalf

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Posted: 16th Aug 2013 13:20

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Yes, a shader gives you more control. But you could do something like the attached - just move the mouse over the object you want to highlight. You can try changing the highlighting colour in these lines:

+ Code Snippet

  if highlight > 0
    color object highlight, rgb(255, 0, 0)
  endif

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Green Gandalf

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Posted: 16th Aug 2013 13:38

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This gives the previous demo a bit more control over the highlighting:

+ Code Snippet

repeat
  mX = mousex()
  mY = mousey()
  for obj = 1 to 10
    texture object obj, 1
    set object ambient obj, 1
  next obj
  highlight = pick object(mX, mY, 1, 10)
  text 20, 20, "highlight object = "+str$(highlight)
  if highlight > 0
    color object highlight, rgb(0, 0, 0) ` turns off the effect of the directional light
    set object emissive highlight, rgb(0,64,0)
    set object ambient highlight, 0
  endif 
  sync
until spacekey()

If you increase the color object value you can increase the effect of the main lights in the scene. It's up to you to find a suitable balance.

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MrValentine

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Posted: 16th Aug 2013 17:30

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I pulled this shader from Dark Shader, Just create a new text file and rename to HaloHighlight.fx or probably anything relevant to you...

string Description = "This shader will make the edge of the object brighter than the rest to produce a halo effect. Works best on curved objects.";
string Thumbnail = "Halo.png";

float4x4 WorldViewProj : WorldViewProjection;
float4x4 World : World;
float4x4 WorldView : WorldView;
float4 eyePos : CameraPosition;

float MinLimit
<
	string UIWidget = "slider";
	float UIMax = 1.0;
	float UIMin = 0.0;
	float UIStep = 0.01;
> = 0.100000;

float MaxLimit
<
	string UIWidget = "slider";
	float UIMax = 1.0;
	float UIMin = 0.0;
	float UIStep = 0.01;
> = 0.700000;

texture BaseTex
<
	string ResourceName = "";
>;

sampler BaseSmp = sampler_state 
{
	Texture = <BaseTex>;
	MinFilter = Anisotropic;
	MagFilter = Linear;
	MipFilter = Linear;
	AddressU = Wrap;
	AddressV = Wrap;
};

struct app_in
{
	float4 pos : POSITION;
	float2 uv : TEXCOORD0;
	float3 normal : NORMAL;
};

struct vs_out
{
	float4 pos : POSITION;
	float2 uv : TEXCOORD0;
	float3 wNormal : TEXCOORD1;
	float4 wPos : TEXCOORD2;
};

vs_out DefaultVertexShader( app_in IN )
{
	vs_out OUT;
	
	OUT.pos = mul( IN.pos, WorldViewProj );
	OUT.uv = IN.uv;
	
	float4 wPos = mul( IN.pos, World );
	float3 wNormal = mul( IN.normal, (float3x3)World );
	
	OUT.wNormal = normalize(wNormal);
	OUT.wPos = wPos;
	
	return OUT;
}

float4 DefaultPixelShader( vs_out IN ) : COLOR
{
	//calculate the angle between the normal and the camera
	float3 viewDir = normalize(eyePos - IN.wPos);
	float angle = saturate( dot( IN.wNormal, viewDir ) );
	
	//limit the angle
	angle = smoothstep( MinLimit, MaxLimit, angle );
	
	//use this value to produce a color
	float4 color = lerp( float4( 0.8,0.8,0.8,0), float4(0.2,0.2,0.2,0), angle );
	
	return float4(color.xyz,1) + float4(color.xyz,1)*tex2D( BaseSmp, IN.uv );
}

technique MyShader
{
	pass p0
	{
		VertexShader = compile vs_1_1 DefaultVertexShader( );
		PixelShader = compile ps_2_0 DefaultPixelShader( );
	}
}

+ Code Snippet

string Description = "This shader will make the edge of the object brighter than the rest to produce a halo effect. Works best on curved objects.";
string Thumbnail = "Halo.png";

float4x4 WorldViewProj : WorldViewProjection;
float4x4 World : World;
float4x4 WorldView : WorldView;
float4 eyePos : CameraPosition;

float MinLimit
<
	string UIWidget = "slider";
	float UIMax = 1.0;
	float UIMin = 0.0;
	float UIStep = 0.01;
> = 0.100000;

float MaxLimit
<
	string UIWidget = "slider";
	float UIMax = 1.0;
	float UIMin = 0.0;
	float UIStep = 0.01;
> = 0.700000;

texture BaseTex
<
	string ResourceName = "";
>;

sampler BaseSmp = sampler_state 
{
	Texture = <BaseTex>;
	MinFilter = Anisotropic;
	MagFilter = Linear;
	MipFilter = Linear;
	AddressU = Wrap;
	AddressV = Wrap;
};

struct app_in
{
	float4 pos : POSITION;
	float2 uv : TEXCOORD0;
	float3 normal : NORMAL;
};

struct vs_out
{
	float4 pos : POSITION;
	float2 uv : TEXCOORD0;
	float3 wNormal : TEXCOORD1;
	float4 wPos : TEXCOORD2;
};

vs_out DefaultVertexShader( app_in IN )
{
	vs_out OUT;
	
	OUT.pos = mul( IN.pos, WorldViewProj );
	OUT.uv = IN.uv;
	
	float4 wPos = mul( IN.pos, World );
	float3 wNormal = mul( IN.normal, (float3x3)World );
	
	OUT.wNormal = normalize(wNormal);
	OUT.wPos = wPos;
	
	return OUT;
}

float4 DefaultPixelShader( vs_out IN ) : COLOR
{
	//calculate the angle between the normal and the camera
	float3 viewDir = normalize(eyePos - IN.wPos);
	float angle = saturate( dot( IN.wNormal, viewDir ) );
	
	//limit the angle
	angle = smoothstep( MinLimit, MaxLimit, angle );
	
	//use this value to produce a color
	float4 color = lerp( float4( 0.8,0.8,0.8,0), float4(0.2,0.2,0.2,0), angle );
	
	return float4(color.xyz,1) + float4(color.xyz,1)*tex2D( BaseSmp, IN.uv );
}

technique MyShader
{
	pass p0
	{
		VertexShader = compile vs_1_1 DefaultVertexShader( );
		PixelShader = compile ps_2_0 DefaultPixelShader( );
	}
}

Hope this helps... and also hope it is ok for me to post that code... if not let me know or a MOD can remove it...

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Nabz_32x

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Posted: 18th Aug 2013 03:58 Edited at: 18th Aug 2013 04:01

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Thx for all the Info guys

your Solution Gandalf is a nice Idea,
as I haven't Mastered the Art of texturing an x object
With a Single file like you did in your example yet,
I Will have to delete the object and clone it to Have it Textured again.

I will Look at the Halo effect shader tomorow,
This will be my First Time working with shaders.

I also have problems with object transparency /
Alpha mapping, as transparent objects won't Show
My selfmade polys which are behind them and solid,
Only disabling the z Buffer write for the transparent objects
seems to solve this.
however The transition while slowly fading the object
Transparent is a Bit akward then.
are there some object settings that could cause my
Polys to be hidden behind transparent objects?

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MrValentine

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Posted: 18th Aug 2013 04:09

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Have you looked at SET OBJECT NORMALS yet? I used it on my plant environment demo if you have seen it... It solved some lighting issues I had...

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Nabz_32x

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Posted: 18th Aug 2013 16:54

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The Set Object Normals command works fine to improve the highlighting effect thx.

As for the Transparency issues, using the set object transparency command works well without disabling the zwrite abillity of the object. However it only works on the plains I created, the single Polys will give some very random results still( tried all transparency flags through).

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MrValentine

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Posted: 19th Aug 2013 13:15

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Any luck with the shader?

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Nabz_32x

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Posted: 20th Aug 2013 18:44 Edited at: 20th Aug 2013 21:44

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This is how the shader Looks.
to make the Object effectless again I used the SET SHADING OFF command,
but it didn´t seem to affect the object at all.
Do I have to recreate the whole object again to get it back to normal?
Edit:
I have found the solution to this was to use SET OBJECT EFFECT Nr , 0 instead of SET SHADING OFF Nr

Is this effect meant to look like this? I Need to know this,
because my graphics Card is dying on me most of the time,
when using shaders.

Edit2:
The gray parts seem to be those parts of the object, which where simply coloured and not textured, I plan on using improved textures anyway, so there won´t be parts of objects which are just coloured anymore in the future.
So I think I will go with this shader for highlighting, is it okay to just use this or do I have to buy dark shader first?

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Green Gandalf

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Posted: 20th Aug 2013 22:24

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Quote: "is it okay to just use this "

Yes.

Quote: "do I have to buy dark shader first"

No. Dark Shader is just for developing and testing shaders. If you're just using shaders other people have written then you don't need it.

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MrValentine

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Posted: 20th Aug 2013 22:34

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Sweet, I helped again

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DarkBASIC Professional Discussion / fading animated objects