Ambient Pass with transformed verticis, need help plz!

Unity Engine
1

Hi,
I am working on Diffuse Shader that bends objects and I want to have it fully compatible with the normal light system in unity. The problem seems to be in the ambient pass because I don’t know what exactly is happing there. I cannot use the ShaderLab Ambient pass because I am not able to transform vertices before, right? So I tried to rebuild it. The problem is now that it is only considering one light in the scene. Any help would be very nice, thank you.

Shader "Diffuse-Bend" {
Properties {
	_Color ("Main Color", Color) = (1,1,1,1)
	_MainTex ("Base (RGB)", 2D) = "white" {}
	_Direction("Direction", Vector) = (0,0,0,0)
}

Category {
	Tags { "RenderType"="Opaque" }
	LOD 200
	Blend AppSrcAdd AppDstAdd
	Fog { Color [_AddFog] }
	
	// ------------------------------------------------------------------
	// ARB fragment program
	
	SubShader {
		// Pixel lights
		Pass {
			Name "PPL"
			Tags { "LightMode" = "Pixel" }
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_builtin
#pragma fragmentoption ARB_fog_exp2
#pragma fragmentoption ARB_precision_hint_fastest
#include "UnityCG.cginc"
#include "AutoLight.cginc"




struct v2f {
	V2F_POS_FOG;
	LIGHTING_COORDS
	float2	uv;
	float3	normal;
	float3	lightDir;
};

uniform float4 _MainTex_ST;
uniform float4 _Color;
uniform float4 _Direction;

v2f vert (appdata_base v)
{
	v2f o;
	float4 f4Vertex = v.vertex;
	// transform vertex in world space
	float4 f4WorldPos = mul(_Object2World,f4Vertex ); 
	f4WorldPos += _Direction * (pow(v.vertex.z,2)/10);
	float4 f4NewPos = mul(_World2Object,f4WorldPos ); 
	// put i back to object space
	o.pos = mul( glstate.matrix.mvp, f4NewPos );

	o.fog = o.pos.z;
	o.normal = v.normal;
	o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
	o.lightDir = ObjSpaceLightDir( f4NewPos );
	TRANSFER_VERTEX_TO_FRAGMENT(o);
	return o;
}

uniform sampler2D _MainTex;

float4 frag (v2f i) : COLOR
{
	// The eternal tradeoff: do we normalize the normal?
	//float3 normal = normalize(i.normal);
	float3 normal = i.normal;
		
	half4 texcol = tex2D( _MainTex, i.uv );
	
	float4 f4Ambient = _PPLAmbient*2*texcol;
	float4 f4Diff = saturate(DiffuseLight( i.lightDir, normal, texcol, LIGHT_ATTENUATION(i) ));
	return f4Ambient+f4Diff;
}
ENDCG
		}
	}

[/code]

2

Your ambient pass should look like your PPL pass except you should tag it LightMode Always (if you don’t plan on doing a vertex lighting pass) or PixelOrNone (if you do). You can get rid of the lighting code in the ambient version of the pass, and instead just use _PPLAmbient and multiply that with your base colour or whatever you multiply your dynamic lighting result by. I forget if _PPLAmbient is declared in UnityCg. If it isn’t, you’ll have to declare it yourself. Unity will fill it out, though.