Unity3D Shader实现扫描显示效果

本文实例为大家分享了unity3d shader实现扫描显示的具体代码，供大家参考，具体内容如下

通过shader实现，从左向右的扫描显示，可自定义扫描颜色、宽度、速度。

效果图如下

编辑器界面如下

shader源码如下

shader "xm/scaneffect"
{
 properties
 {
 _maintex("main tex", 2d) = "white"{}
 _linecolor("line color", color) = (0,0,0,0)
 _linewidth("line width", range(0, 1.0)) = 0.1
 _rangex("range x", range(0,1.0)) = 1.0
 }

 subshader
 {
 tags {
 "queue" = "transparent"
 }

 zwrite off
 blend srcalpha oneminussrcalpha
 cull back

 pass
 {
 cgprogram

 #pragma vertex vert
 #pragma fragment frag

 #include "lighting.cginc"

 sampler2d _maintex;
 float4 _maintex_st;
 float4 _linecolor;
 float _linewidth;
 float _rangex;

 struct a2v
 {
 float4 vertex : position;
 float4 texcoord : texcoord0;
 };

 struct v2f
 {
 float4 pos : sv_position;
 float2 uv : texcoord0;
 };

 v2f vert(a2v v)
 {
 v2f o;
 o.pos = mul(unity_matrix_mvp, v.vertex);
 o.uv = transform_tex(v.texcoord, _maintex);
 return o;
 }

 fixed4 frag(v2f i) : sv_target
 {
 fixed4 col = tex2d(_maintex, i.uv);

 if(i.uv.x > _rangex)
 {
  clip(-1);
 }
 else if (i.uv.x > _rangex - _linewidth)
 {
  float offsetx = i.uv.x - _rangex +_linewidth;
  fixed xalpha = offsetx / _linewidth;
  col = col * (1 - xalpha) + _linecolor * xalpha;
 }


 return col;
 }

 endcg
 }
 }

 fallback "diffuse"
}

代码调用如下

using unityengine;
using system.collections;
public class scaneffect : monobehaviour
{
 //默认扫描线的宽
 [range(0,1)]
 public float _defaultlinew = 0.2f;
 //扫描的速度
 [range(0, 1)]
 public float _showspeed = 0.02f;

 private meshrenderer _render;

 private void awake()
 {
 _render = getcomponent<meshrenderer>();
 setx(0);
 setlinewidth(0);
 }

 public void setlinewidth(float val)
 {
 _render.material.setfloat("_linewidth", val);
 }
 public void setx(float val)
 {
 _render.material.setfloat("_rangex", val);
 }

 public void show()
 {
 stopcoroutine("showing");
 startcoroutine("showing");
 }
 public void hide()
 {
 stopcoroutine("showing");

 setx(0);
 setlinewidth(0);
 }

 private ienumerator showing()
 {
 float deltax = 0;
 float deltawidth = _defaultlinew;

 setx(deltax);
 setlinewidth(deltawidth);

 while (true)
 {
 if (deltax != 1)
 {
 deltax = mathf.clamp01(deltax + _showspeed);
 setx(deltax);
 }
 else
 {
 if (deltawidth != 0)
 {
  deltawidth = mathf.clamp01(deltawidth - _showspeed);
  setlinewidth(deltawidth);
 }
 else
 {
  break;
 }
 }
 yield return new waitforendofframe();
 }
 }


 public void ongui()
 {
 if (guilayout.button("show"))
 {
 show();
 }
 if (guilayout.button("hide"))
 {
 hide();
 }
 }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。