Grid and overdraw presets.

Added the first two presets: grid and overdraw.

Runtime/Shaders.meta

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Runtime/Shaders/Overdraw.shader

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+Shader "Hidden/Overdraw"
+{
+	SubShader
+	{
+		Tags
+		{
+			"RenderType"="Transparent"
+			"Queue"="Transparent"
+		}
+
+		ZWrite Off
+		ZTest Always
+		Blend SrcAlpha One
+
+		Pass
+		{
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+
+			#include "UnityCG.cginc"
+
+			struct appdata
+			{
+				float4 vertex : POSITION;
+			};
+
+			struct v2f
+			{
+				float4 vertex : SV_POSITION;
+			};
+
+			v2f vert (appdata v)
+			{
+				v2f o;
+				o.vertex = UnityObjectToClipPos(v.vertex);
+				return o;
+			}
+
+			fixed4 _RS_Color;
+
+			fixed4 frag (v2f i) : SV_Target
+			{
+				return _RS_Color;
+			}
+			ENDCG
+		}
+	}
+}

Runtime/Shaders/Overdraw.shader.meta

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Runtime/Shaders/TriPlanarTextureUnlit.shader

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+// https://www.ronja-tutorials.com/post/010-triplanar-mapping/
+
+Shader "Hidden/TriPlanarTexture"
+{
+    SubShader
+    {
+        Tags { "RenderType"="Opaque" }
+
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "UnityCG.cginc"
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+                float3 normal : NORMAL;
+            };
+
+            struct v2f
+            {
+                float4 vertex : SV_POSITION;
+                float3 worldPos : TEXCOORD0;
+                float3 normal : TEXCOORD1;
+            };
+
+            sampler2D _RS_Texture;
+            float4 _RS_Texture_ST;
+            float _RS_Float;
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                o.worldPos = mul(unity_ObjectToWorld, v.vertex);
+                o.normal = normalize(mul(v.normal, (float3x3)unity_WorldToObject));
+                return o;
+            }
+
+            fixed4 frag (v2f i) : SV_Target
+            {
+                //calculate UV coordinates for three projections
+				float2 uv_front = TRANSFORM_TEX(i.worldPos.xy, _RS_Texture);
+				float2 uv_side = TRANSFORM_TEX(i.worldPos.zy, _RS_Texture);
+				float2 uv_top = TRANSFORM_TEX(i.worldPos.xz, _RS_Texture);
+
+                //read texture at uv position of the three projections
+				fixed4 col_front = tex2D(_RS_Texture, uv_front);
+				fixed4 col_side = tex2D(_RS_Texture, uv_side);
+				fixed4 col_top = tex2D(_RS_Texture, uv_top);
+
+                //generate weights from world normals
+				float3 weights = i.normal;
+				//show texture on both sides of the object (positive and negative)
+				weights = abs(weights);
+				//make the transition sharper
+				weights = pow(weights, _RS_Float);
+				//make it so the sum of all components is 1
+				weights = weights / (weights.x + weights.y + weights.z);
+
+				//combine weights with projected colors
+				col_front *= weights.z;
+				col_side *= weights.x;
+				col_top *= weights.y;
+
+				//combine the projected colors
+				fixed4 col = col_front + col_side + col_top;
+
+                return col;
+
+                // return  fixed4(abs(i.normal.xyz), 1);
+            }
+            ENDCG
+        }
+    }
+}

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