Particles not rendering when enters in projector area

Hi, I have particles system of Nitro...When it enters onto projector ,it gets invisible.

Anyone knows why this may be the case?


EDIT

I am using projectors for shadows...When I use particles for bike speed up i.e., nitro speed the particles get cutout by those shadows....

Here is screenshot of it,



Here is my shader code of projectors ,

Code (CSharp):

1. Shader "Projector/Projector Multiply Black"
2. {
3.     Properties
4.     {
5.         _ShadowTex("Cookie", 2D) = "gray" { TexGen ObjectLinear }
6.     _ShadowStrength("Strength",float) = 1
7.     }
8.  
9.         Subshader
10.     {
11.         Tags{ "RenderType" = "Transparent"  "Queue" = "Transparent+100" }
12.         Pass
13.     {
14.         ZWrite Off
15.  
16.         //Fog { Mode Off }
17.  
18.         Blend DstColor Zero
19.  
20.         CGPROGRAM
21. #pragma vertex vert
22. #pragma fragment frag
23. #pragma fragmentoption ARB_fog_exp2
24. #pragma fragmentoption ARB_precision_hint_fastest
25. #include "UnityCG.cginc"
26.  
27.  
28.         struct v2f
29.     {
30.         float4 pos : SV_POSITION;
31.         float2 uv_Main     : TEXCOORD0;
32.     };
33.  
34.     sampler2D _ShadowTex;
35.     float4x4 unity_Projector;
36.     float _ShadowStrength;
37.  
38.     v2f vert(appdata_tan v)
39.     {
40.         v2f o;
41.  
42.  
43.         o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
44.  
45.         o.uv_Main = mul(unity_Projector, v.vertex).xy;
46.  
47.  
48.         return o;
49.     }
50.  
51.     half4 frag(v2f i) : COLOR
52.     {
53.         half4 tex = tex2D(_ShadowTex, i.uv_Main);
54.         half strength = (1 - tex.a*_ShadowStrength);
55.         tex = (strength,strength,strength,strength);
56.         return tex;
57.     }
58.         ENDCG
59.  
60.     }
61.     }
62. }

Here is my particle code,

Code (CSharp):

1. // Simple additive particle shader.
2.  
3. Shader "Custom/Particle additive"
4. {
5. Properties
6. {
7.     _MainTexture ("Particle Texture (Alpha8)", 2D) = "white" {}
8. }
9.  
10. Category
11. {
12.     Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }
13.     Blend SrcAlpha One
14.     Cull Off Lighting Off ZWrite Off Fog {Color (0,0,0,0)}
15.  
16.     BindChannels
17.     {
18.         Bind "Color", color
19.         Bind "Vertex", vertex
20.         Bind "TexCoord", texcoord
21.     }
22.  
23.     SubShader
24.     {
25.         Pass
26.         {
27.             SetTexture [_MainTexture]
28.             {
29.                 combine primary, texture * primary
30.             }
31.         }
32.     }
33. }
34. }

 

Transparent+100 makes it ontop?

 

I tried that on both shader..one of both shaders...but same happening

 

hmm

Change the fog from "Color (0,0,0,0)" to "Mode Off".??

... is the multiply Blend mode operation on the projector the cause? maybe an idea
but perhaps Blend DstColor Zero causes destination = 0 ; source = source * destination

could that shadow be black using frag computation instead of blend mode? RGB = 0, Alpha = 1
///Blend One OneMinusSrcAlpha///...could that work?

 

I able to solve that problem by adding two cameras, one for only rendering particle and other for rest of stuff....It did work pretty good.

I will check it out your solution soon and update you with same.

Thank you so much for your replies.

 

As mentioned in your other thread this was a bug with projectors rendering twice (in this case once at the correct queue before the particles, and once at the end of the queue over the particles).

It's listed as a fixed issue in the 5.4.2 release notes, so I suggest you upgrade to that.

• Graphics: Fixed the issue of projectors rendering twice if transparent objects are in the scene. (814282)