使用shader实现一个图片旋转、某个点挖洞、偏移的功能-Toy模板网

这篇具有很好参考价值的文章主要介绍了使用shader实现一个图片旋转、某个点挖洞、偏移的功能。希望对大家有所帮助。如果存在错误或未考虑完全的地方，请大家不吝赐教，您也可以点击"举报违法"按钮提交疑问。

下面代码实现了Center作为旋转中心点和挖洞中心点，Offset是偏移文章来源地址https://www.toymoban.com/news/detail-408980.html

Shader "Custom/Spin" {
    Properties{
        _MainTex("Texture", 2D) = "white" {}
        _Speed("Speed", Range(0.1, 100)) = 1.0
        _Center("Center", Vector) = (0.5, 0.5, 0.0, 0.0)
        _Opacity("Opacity", Range(0, 1)) = 1.0
        _TransparentLength("TransparentLength", Range(0, 1)) = 0.2
        _Offset("Offset", Vector) = (0.5, 0.5, 0.0, 0.0)
    }
        SubShader{
            Tags {"Queue" = "Transparent" "RenderType" = "Opaque"}
            LOD 100

            Pass {
                Blend SrcAlpha OneMinusSrcAlpha // 启用混合模式
                CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag
                #include "UnityCG.cginc"

                struct appdata {
                    float4 vertex : POSITION;
                    float2 uv : TEXCOORD0;
                };

                struct v2f {
                    float2 uv : TEXCOORD0;
                    float4 vertex : SV_POSITION;
                };

                sampler2D _MainTex;
                float2 _Center;
                float _Speed;
                float _Opacity;
                float _TransparentLength;
                float2 _Offset;

                v2f vert(appdata v) {
                    v2f o;
                    o.vertex = UnityObjectToClipPos(v.vertex);
                    o.uv = v.uv;
                    return o;
                }

                fixed4 frag(v2f i) : SV_Target{
                    float2 center = _Center;
                    float2 uv = i.uv - center;
                    float angle = _Time.y * _Speed;
                    float s = sin(angle);
                    float c = cos(angle);
                    float2 offset = _Offset;
                    float2 rotatedUV = float2((uv.x + offset.x) * c - (uv.y + offset.y) * s, (uv.x + offset.x) * s + (uv.y + offset.y) * c);
                    float dist = length(uv);
                    if (dist < _TransparentLength) {
                        discard;
                    }
                    fixed4 col = tex2D(_MainTex, rotatedUV + center);
                    col.a *= _Opacity;
                    return col;
                }


                /*fixed4 frag(v2f i) : SV_Target{
                    float2 center = _Center;
                    float2 uv = i.uv - center;
                    float angle = _Time.y * _Speed;
                    float s = sin(angle);
                    float c = cos(angle);
                    float2 rotatedUV = float2(uv.x * c - uv.y * s, uv.x * s + uv.y * c);
                    float dist = length(uv);
                    if (dist < _TransparentLength) {
                        discard;
                    }
                    fixed4 col = tex2D(_MainTex, rotatedUV + center);
                    col.a *= _Opacity;
                    return col;
                }*/


                //fixed4 frag(v2f i) : SV_Target {
                //    float2 center = _Center;
                //    float2 uv = i.uv - center;
                //    float angle = _Time.y * _Speed;
                //    float s = sin(angle);
                //    float c = cos(angle);
                //    float2 rotatedUV = float2(uv.x * c - uv.y * s, uv.x * s + uv.y * c);
                //    fixed4 col = tex2D(_MainTex, rotatedUV + center); // 采样纹理
                //    col.a *= _Opacity; // 乘以不透明度
                //    return col;
                //}
                ENDCG
            }
        }
            FallBack "Diffuse"
}

到了这里，关于使用shader实现一个图片旋转、某个点挖洞、偏移的功能的文章就介绍完了。如果您还想了解更多内容，请在右上角搜索TOY模板网以前的文章或继续浏览下面的相关文章，希望大家以后多多支持TOY模板网！