wip: Ray mapping

Assets/_Content/Models/VFX/Ray/Shaders/Ray.shadergraph

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 {
     "m_SGVersion": 0,
     "m_Type": "UnityEditor.ShaderGraph.Vector1MaterialSlot",
@@ -5731,6 +6200,29 @@
     "m_LiteralMode": false
 }
 
+{
+    "m_SGVersion": 0,
+    "m_Type": "UnityEditor.ShaderGraph.Vector3MaterialSlot",
+    "m_ObjectId": "8ca90b9f64714c4aa127830e7a49509e",
+    "m_Id": 0,
+    "m_DisplayName": "Out",
+    "m_SlotType": 1,
+    "m_Hidden": false,
+    "m_ShaderOutputName": "Out",
+    "m_StageCapability": 3,
+    "m_Value": {
+        "x": 0.0,
+        "y": 0.0,
+        "z": 0.0
+    },
+    "m_DefaultValue": {
+        "x": 0.0,
+        "y": 0.0,
+        "z": 0.0
+    },
+    "m_Labels": []
+}
+
 {
     "m_SGVersion": 0,
     "m_Type": "UnityEditor.ShaderGraph.Vector1MaterialSlot",
@@ -6561,6 +7053,31 @@
     "m_OutputChannel": 0
 }
 
+{
+    "m_SGVersion": 0,
+    "m_Type": "UnityEditor.ShaderGraph.Vector4MaterialSlot",
+    "m_ObjectId": "a4cd5385a9ae42569ee81555e96ef74c",
+    "m_Id": 0,
+    "m_DisplayName": "Color",
+    "m_SlotType": 1,
+    "m_Hidden": false,
+    "m_ShaderOutputName": "Out",
+    "m_StageCapability": 3,
+    "m_Value": {
+        "x": 0.0,
+        "y": 0.0,
+        "z": 0.0,
+        "w": 0.0
+    },
+    "m_DefaultValue": {
+        "x": 0.0,
+        "y": 0.0,
+        "z": 0.0,
+        "w": 0.0
+    },
+    "m_Labels": []
+}
+
 {
     "m_SGVersion": 0,
     "m_Type": "UnityEditor.ShaderGraph.Vector3MaterialSlot",
@@ -8069,6 +8586,28 @@
     }
 }
 
+{
+    "m_SGVersion": 0,
+    "m_Type": "UnityEditor.ShaderGraph.UVMaterialSlot",
+    "m_ObjectId": "d4d263ad95a64d7bab2b59c02334ca1d",
+    "m_Id": 2,
+    "m_DisplayName": "UV",
+    "m_SlotType": 0,
+    "m_Hidden": false,
+    "m_ShaderOutputName": "UV",
+    "m_StageCapability": 3,
+    "m_Value": {
+        "x": 0.0,
+        "y": 0.0
+    },
+    "m_DefaultValue": {
+        "x": 0.0,
+        "y": 0.0
+    },
+    "m_Labels": [],
+    "m_Channel": 0
+}
+
 {
     "m_SGVersion": 0,
     "m_Type": "UnityEditor.ShaderGraph.Vector1MaterialSlot",
@@ -8092,7 +8631,7 @@
     "m_Title": "Random",
     "m_Position": {
         "x": -2910.000244140625,
-        "y": -235.0
+        "y": -235.00001525878907
     }
 }
 
@@ -8176,6 +8715,29 @@
     "m_LiteralMode": false
 }
 
+{
+    "m_SGVersion": 0,
+    "m_Type": "UnityEditor.ShaderGraph.Vector3MaterialSlot",
+    "m_ObjectId": "d85f7a35cf404fd2b6d9bd9391c30446",
+    "m_Id": 4,
+    "m_DisplayName": "PositionOS",
+    "m_SlotType": 0,
+    "m_Hidden": false,
+    "m_ShaderOutputName": "PositionOS",
+    "m_StageCapability": 3,
+    "m_Value": {
+        "x": 0.0,
+        "y": 0.0,
+        "z": 0.0
+    },
+    "m_DefaultValue": {
+        "x": 0.0,
+        "y": 0.0,
+        "z": 0.0
+    },
+    "m_Labels": []
+}
+
 {
     "m_SGVersion": 0,
     "m_Type": "UnityEditor.ShaderGraph.Vector1MaterialSlot",
@@ -8192,6 +8754,31 @@
     "m_LiteralMode": false
 }
 
+{
+    "m_SGVersion": 0,
+    "m_Type": "UnityEditor.ShaderGraph.Vector4MaterialSlot",
+    "m_ObjectId": "d931b95b4f614bd898b44d12da9c0c74",
+    "m_Id": 13,
+    "m_DisplayName": "ScreenPos",
+    "m_SlotType": 0,
+    "m_Hidden": false,
+    "m_ShaderOutputName": "ScreenPos",
+    "m_StageCapability": 3,
+    "m_Value": {
+        "x": 0.0,
+        "y": 0.0,
+        "z": 0.0,
+        "w": 0.0
+    },
+    "m_DefaultValue": {
+        "x": 0.0,
+        "y": 0.0,
+        "z": 0.0,
+        "w": 0.0
+    },
+    "m_Labels": []
+}
+
 {
     "m_SGVersion": 0,
     "m_Type": "UnityEditor.ShaderGraph.DynamicValueMaterialSlot",
@@ -8856,6 +9443,29 @@
     }
 }
 
+{
+    "m_SGVersion": 0,
+    "m_Type": "UnityEditor.ShaderGraph.Vector3MaterialSlot",
+    "m_ObjectId": "eda228c55b8e47fab8c2bfb3decc6a23",
+    "m_Id": 3,
+    "m_DisplayName": "Output",
+    "m_SlotType": 1,
+    "m_Hidden": false,
+    "m_ShaderOutputName": "Output",
+    "m_StageCapability": 3,
+    "m_Value": {
+        "x": 0.0,
+        "y": 0.0,
+        "z": 0.0
+    },
+    "m_DefaultValue": {
+        "x": 0.0,
+        "y": 0.0,
+        "z": 0.0
+    },
+    "m_Labels": []
+}
+
 {
     "m_SGVersion": 0,
     "m_Type": "UnityEditor.ShaderGraph.SplitNode",
@@ -9142,6 +9752,22 @@
     }
 }
 
+{
+    "m_SGVersion": 0,
+    "m_Type": "UnityEditor.ShaderGraph.Vector1MaterialSlot",
+    "m_ObjectId": "f855c60d63ce493c916822f01cc0aa8c",
+    "m_Id": 5,
+    "m_DisplayName": "G",
+    "m_SlotType": 1,
+    "m_Hidden": false,
+    "m_ShaderOutputName": "G",
+    "m_StageCapability": 2,
+    "m_Value": 0.0,
+    "m_DefaultValue": 0.0,
+    "m_Labels": [],
+    "m_LiteralMode": false
+}
+
 {
     "m_SGVersion": 0,
     "m_Type": "UnityEditor.ShaderGraph.Vector3MaterialSlot",

Assets/_Content/Models/VFX/Ray/Shaders/include/Ray.hlsl

@@ -1,16 +1,74 @@
-void Facing_float(float3 ObjectPos, float3 Origin, float3 InUp, uint Orthographic, out float3 FacingWorldPos, out float3 FacingObjectPos, out float3 Right, out float3 Up, out float3 Forward)
+#include "Assets/_Content/Shaders/Include/Noises.hlsl"
+
+float2 WorldToScreenUV(float3 posWS)
 {
-    float3 origin = TransformObjectToWorld(float3(0, 0, 0));
+    float4 clip = TransformWorldToHClip(posWS);
-    float3 view = lerp(normalize(origin - _WorldSpaceCameraPos.xyz), GetViewForwardDir(), Orthographic);
+    float2 ndc = clip.xy / clip.w; // [-1, 1]
+    return ndc * .5 + .5; // [0, 1]
+}
 
-    Up = normalize(InUp);
+float3 GetBillboardPositionWS(float3 PositionOS, float3 PivotWS, float3 ViewDirWS)
-    Right = normalize(cross(Up, view));
+{
-    Forward = cross(Right, Up);
+    float3 upWS = normalize(TransformObjectToWorldDir(float3(0, 1, 0)));
 
-    FacingWorldPos = Origin;
+    float3 rightWS = cross(upWS, ViewDirWS);
-    FacingWorldPos += ObjectPos.x * length(TransformObjectToWorld(float3(1, 0, 0)) - origin) * Right;
-    FacingWorldPos += ObjectPos.y * length(TransformObjectToWorld(float3(0, 1, 0)) - origin) * Up;
-    FacingWorldPos += ObjectPos.z * length(TransformObjectToWorld(float3(0, 0, 1)) - origin) * Forward;
 
-    FacingObjectPos = TransformWorldToObject(FacingWorldPos);
+    if (dot(rightWS, rightWS) < 1e-5)
+        rightWS = normalize(TransformObjectToWorldDir(float3(1, 0, 0)));
+    else
+        rightWS = normalize(rightWS);
+
+    float3 forwardWS = normalize(cross(rightWS, upWS));
+
+    return PivotWS + PositionOS.x * rightWS + PositionOS.y * upWS + PositionOS.z * forwardWS;
+}
+
+float3 ApplayerTaperAndScale(float3 PositionOS, float3 Scale)
+{
+    float taper = lerp(Scale.z, 1, saturate(PositionOS.y));
+
+    float3 p = PositionOS;
+    p.xy *= Scale.xy;
+    p.x *= taper;
+
+    return p;
+}
+
+void Ray_float
+(
+    float3 Color,
+    float3 PositionOS,
+    float4 ScreenPos,
+    uint Orthographic,
+    out float3 OutPosition,
+    out float3 OutColor
+)
+{
+    float3 pivot = TransformObjectToWorld(float3(0, 0, 0));
+
+    float3 scale = float3
+    (
+        length(TransformObjectToWorld(float3(1, 0, 0)) - pivot),
+        length(TransformObjectToWorld(float3(0, 1, 0)) - pivot),
+        length(TransformObjectToWorld(float3(0, 0, 1)) - pivot)
+    );
+
+    float3 viewDir = lerp(normalize(pivot - _WorldSpaceCameraPos.xyz), GetViewForwardDir(), Orthographic);
+
+    float3 pOS_0 = ApplayerTaperAndScale(PositionOS, scale);
+    float3 pOS_1 = ApplayerTaperAndScale(float3( .5, PositionOS.y, 0), scale);
+    float3 pOS_2 = ApplayerTaperAndScale(float3(-.5, PositionOS.y, 0), scale);
+              
+    float3 pWS_0 = GetBillboardPositionWS(pOS_0, pivot, viewDir);
+    float3 pWS_1 = GetBillboardPositionWS(pOS_1, pivot, viewDir);
+    float3 pWS_2 = GetBillboardPositionWS(pOS_2, pivot, viewDir);
+
+    float2 pSC_0 = ScreenPos.xy;
+    float2 pSC_1 = WorldToScreenUV(pWS_1);
+    float2 pSC_2 = WorldToScreenUV(pWS_2);
+    
+    float2 uv = float2(distance(pSC_0.x, pSC_2.x) / distance(pSC_1.x, pSC_2.x), pOS_0.y / scale.y);
+    
+    OutPosition = TransformWorldToObject(pWS_0);
+    OutColor = float3(uv, 0);
 }