Unable to set global float4 from script in custom shader

Questions & Answers
1

I have been banging my head against the wall for a while now but are unable to set a global value in my shader. I am trying to use clip to remove everything within a certain area.

Shader "Custom/ProxV2" {
	Properties {
		_Color ("Color", Color) = (1,1,1,1)
		_MainTex ("Albedo (RGB)", 2D) = "white" {}
		_Glossiness ("Smoothness", Range(0,1)) = 0.5
		_Metallic ("Metallic", Range(0,1)) = 0.0
	}
	SubShader {
		Tags { "RenderType"="Opaque" }
		LOD 200
		
		CGPROGRAM
		// Physically based Standard lighting model, and enable shadows on all light types
		#pragma surface surf Standard fullforwardshadows vertex:vert

		// Use shader model 3.0 target, to get nicer looking lighting
		#pragma target 3.0

		uniform float4 _Center;

		sampler2D _MainTex;

		struct Input {
			float2 uv_MainTex;
			float4 position;
		};

		void vert(inout appdata_full v, out Input o)
		{
			UNITY_INITIALIZE_OUTPUT(Input, o);
			o.position = mul(unity_ObjectToWorld, v.vertex);
		}

		half _Glossiness;
		half _Metallic;
		fixed4 _Color;

		void surf (Input IN, inout SurfaceOutputStandard o) {
			clip(distance(float4(IN.position.x, 0, IN.position.z, 0), float4(_Center.x, 0, _Center.z, 0)) - 1);
			// Albedo comes from a texture tinted by color
			fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
			o.Albedo = c.rgb;
			// Metallic and smoothness come from slider variables
			o.Metallic = _Metallic;
			o.Smoothness = _Glossiness;
			o.Alpha = c.a;
		}
		ENDCG
	}
	FallBack "Diffuse"
}

I then try to set the _Center variable from a script

public class UpdateCenter : MonoBehaviour {

	// Update is called once per frame
	void Update () {
	    Shader.SetGlobalFloatArray("_Center", new[] { 10.0f, 20.0f, 30.0f, 40.0f });
	}
}

But absolutely nothing seems to happen. I am probably doing something stupid but I cannot figure out what it is…

2

_Center is not a float array, it’s a float4 vector. So you set it with SetVector.

GetComponent<Renderer>().sharedMaterial.SetVector("_Center", new Vector4(10.0f, 20.0f, 30.0f, 40.0f));