在Unity Shaderlab中，如何使用lerp和deltaTime为某个值设置动画
在Unity Shaderlab中，如何使用lerp和deltaTime为某个值设置动画
提问于 2018-05-20 04:49:40
如何使用自定义标准曲面着色器为目标值设置动画效果？
例如：
...
float targetAlpha; //Set by the property block, or a C# script
float currrentAlpha; //Used internally only.
void surf (Input IN, inout SurfaceOutputStandard o)
{
currrentAlpha = lerp(currrentAlpha, targetAlpha, unity_DeltaTime.x);
o.Alpha = currrentAlpha;
}此代码不起作用，但应演示目标是什么:设置targetAlpha时，着色器将淡入该值。
回答 2
Stack Overflow用户
发布于 2018-05-20 07:19:59
有几种方法可以做到这一点。其中之一是使用内置着色器变量：
Shader "Custom/Test" {
Properties {
_Color ("Color", Color) = (1,1,1,1)
_MainTex ("Albedo (RGB)", 2D) = "white" {}
_TargetAlpha ("TargetAlpha", 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 alpha:fade
// Use shader model 3.0 target, to get nicer looking lighting
#pragma target 3.0
sampler2D _MainTex;
struct Input {
float2 uv_MainTex;
};
half _Alpha;
fixed4 _Color;
half _TargetAlpha;
void surf (Input IN, inout SurfaceOutputStandard o)
{
// Albedo comes from a texture tinted by color
fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
o.Albedo = c.rgb;
o.Alpha = lerp(o.Alpha, _TargetAlpha, clamp(_SinTime.w, 0, 1));
}
ENDCG
}
FallBack "Diffuse"
}Stack Overflow用户
发布于 2019-10-16 14:28:12
上面答案中的着色器在Unity 2018.2中仍然有效。但是，_SinTime在-1和1之间振荡，而我们希望范围在0和1之间。代码clamp(_SinTime.w, 0, 1)钳位到所需的值，但是alpha停留在0的时间太长。所以我们需要绝对值，比如：abs(_SinTime.w)。
修改后的明暗器：
Shader "Custom/Test" {
Properties {
_Color ("Color", Color) = (1,1,1,1)
_MainTex ("Albedo (RGB)", 2D) = "white" {}
_TargetAlpha ("TargetAlpha", 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 alpha:fade
// Use shader model 3.0 target, to get nicer looking lighting
#pragma target 3.0
sampler2D _MainTex;
struct Input {
float2 uv_MainTex;
};
half _Alpha;
fixed4 _Color;
half _TargetAlpha;
void surf (Input IN, inout SurfaceOutputStandard o)
{
// Albedo comes from a texture tinted by color
fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
o.Albedo = c.rgb;
o.Alpha = lerp(o.Alpha, _TargetAlpha, abs(_SinTime.w));
}
ENDCG
}
FallBack "Diffuse"
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50429374
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