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U3D 基于NGUI写的 listView特效裁剪

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Unity NGUI UIPanel下对粒子或自定义Mesh的剪裁

修改UIDrawCall文件

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public void UpdateSubMaterials(UIFilterDCWidget uiFilter)
{
    UIPanel currentPanel = panel;

    if (currentPanel.hasClipping)
    {
        float angle = 0f;
        Vector4 cr = currentPanel.drawCallClipRange;

        // Clipping regions past the first one need additional math
        if (currentPanel != panel)
        {
            Vector3 pos = currentPanel.cachedTransform.InverseTransformPoint(panel.cachedTransform.position);
            cr.x -= pos.x;
            cr.y -= pos.y;

            Vector3 v0 = panel.cachedTransform.rotation.eulerAngles;
            Vector3 v1 = currentPanel.cachedTransform.rotation.eulerAngles;
            Vector3 diff = v1 - v0;

            diff.x = NGUIMath.WrapAngle(diff.x);
            diff.y = NGUIMath.WrapAngle(diff.y);
            diff.z = NGUIMath.WrapAngle(diff.z);

            if (Mathf.Abs(diff.x) > 0.001f || Mathf.Abs(diff.y) > 0.001f)
                Debug.LogWarning("Panel can only be clipped properly if X and Y rotation is left at 0", panel);

            angle = diff.z;
        }
        var renderers = uiFilter.gameObject.GetComponentsInChildren<Renderer>();
        for (int k = 0; k < renderers.Length; k++)
        {
            if (renderers[k].sharedMaterial != null)
            {
                // Pass the clipping parameters to the shader
                SetClipping(0, cr, currentPanel.clipSoftness, angle, renderers[k].sharedMaterial);
                renderers[k].sharedMaterial.SetMatrix(property_UIWorldtoUIRoot, currentPanel.gameObject.transform.worldToLocalMatrix);
            }
        }
    }
    else
    {
        var renderers = uiFilter.gameObject.GetComponentsInChildren<Renderer>();
        for (int k = 0; k < renderers.Length; k++)
        {
            if (renderers[k].sharedMaterial != null)
            {
                renderers[k].sharedMaterial.SetVector(ClipRange[0], new Vector4(0, 0, 0, 0));
                renderers[k].sharedMaterial.SetVector(ClipArgs[0], new Vector4(1000, 1000, 0, 0));
                renderers[k].sharedMaterial.SetMatrix(property_UIWorldtoUIRoot, currentPanel.gameObject.transform.worldToLocalMatrix);
            }
        }
    }
}

Shader代码

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Shader "GameUI/Particles/Transparent Particle Add 1"
{
	Properties
	{
		_InitColor("InitColor", Color) = (1,1,1,1)
		_MainTex ("Base (RGB), Alpha (A)", 2D) = "black" {}
		_AlphaTex ("Alpha Texture",2D) = "red" {}
		
	}

	SubShader
	{
		LOD 100

		Tags
		{
			"Queue" = "Transparent"
			"IgnoreProjector" = "True"
			"RenderType" = "Transparent"
			"RenderPipeline" = "UniversalPipeline"
		}
		
		Pass
		{
			Cull Off
			Lighting Off
			ZWrite Off
			Offset -1, -1
			Fog { Mode Off }
			ColorMask RGB
			Blend One One

			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#include "UnityCG.cginc"

			sampler2D _MainTex;
			float4 _MainTex_ST;
			sampler2D _AlphaTex;
			float4 _ClipRange0 = float4(0.0, 0.0, 1.0, 1.0);
			float2 _ClipArgs0 = float2(1000.0, 1000.0);
			half4 _InitColor;

			float4x4 _UIWorldtoUIRoot;

			struct appdata_t
			{
				float4 vertex : POSITION;
				half4 color : COLOR;
				float2 texcoord : TEXCOORD0;
			};

			struct v2f
			{
				float4 vertex : POSITION;
				half4 color : COLOR;
				float2 texcoord : TEXCOORD0;
				float2 worldPos : TEXCOORD1;
			};

			v2f o;

			v2f vert (appdata_t v)
			{
				o.vertex = UnityObjectToClipPos(v.vertex);
				float4 worldPos = mul(unity_ObjectToWorld, v.vertex);
				worldPos = mul(_UIWorldtoUIRoot, worldPos);
				o.color = v.color;
				o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
				o.worldPos = worldPos.xy * _ClipRange0.zw + _ClipRange0.xy;
				return o;
			}

			half4 frag (v2f IN) : COLOR
			{
				// Softness factor
				float2 factor = (float2(1.0, 1.0) - abs(IN.worldPos)) * _ClipArgs0;
				log2(factor);
				// Sample the texture
				//half4 col = GreyUI(_MainTex,_AlphaTex,IN.texcoord,IN.color);
				half4 col = tex2D(_MainTex, IN.texcoord) * IN.color;
				col.a = tex2D(_AlphaTex, IN.texcoord).r * IN.color.a;
				col.a *= clamp( min(factor.x, factor.y), 0.0, 1.0);
				col *= _InitColor;
				col.rgb *= col.a;

				return col;
			}
			ENDCG
		}
	}	
}