unity shader 绘制钟表
1：效果图如下
2：shader代码如下：
Shader "Unlit/clock"
{
Properties
{
_MainTex ("Texture", 2D) = "white" {}
hors("hors",int) = 13
mins("mins",int) = 30
secs("secs",int) = 30
mils("mils",int) = 30
}
SubShader
{
Tags { "RenderType"="Opaque" }
LOD 100
Pass
{
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;
float4 _MainTex_ST;
int hors;
int mins;
int secs;
int mils;
float lerpLine(float2 _LP1,float2 _LP2,float2 pos,float width) {
if(dot(pos - _LP1, _LP2- _LP1)>=0)
{
float d = 1;
d = abs((_LP2.y - _LP1.y)*pos.x + (_LP1.x - _LP2.x)*pos.y + _LP2.x*_LP1.y - _LP2.y*_LP1.x) / sqrt(pow(_LP2.y - _LP1.y, 2) + pow(_LP1.x - _LP2.x, 2));
if (d < width)
{
return min(1, abs(width - d) / width*2);
}
else {
return 0;
}
}
else {
return 0;
}
}
fixed3 backColor(float2 uv)
{
fixed3 nightColor = fixed3(0.2, 0.2, 0.2) + 0.1*uv.y;
fixed3 dayColor = fixed3(0.5, 0.6, 0.7) + 0.2*uv.y;
fixed3 col = lerp(nightColor, dayColor, smoothstep(5.0, 7.0, hors) -
smoothstep(19.0, 21.0, hors));
return col;
}
fixed3 drawCircle(float2 uv,float2 pos,float radio, float radio1,float width, float width1) {
float dis = distance(uv, pos);
//时针 分针 秒针
if (dis >= radio1 + width1)
{
float3 col = lerp(fixed3(0, 0, 0), fixed3(1, 1, 1), min(1, (radio - dis) * 200));
int hor = hors % 12;
float hor_angle = (90.0 - 30.0 * hor - mins / 600.0) / 57.29578;
float min_angle = (90.0 - mins*6 - secs/60.0) / 57.29578;
float sec_angle = (90.0 - secs * 6) / 57.29578;
if (dis < 0.15)
{
//时针
float lerpV = lerpLine(pos, float2(0.15*cos(hor_angle) + pos.x, 0.15*sin(hor_angle) + pos.y), uv, 0.005);
if(lerpV>0)
return lerp(col, float3(0, 0, 0), lerpV);
}
if (dis < 0.25)
{
//分针
float lerpV = lerpLine(pos, float2(0.25*cos(min_angle) + pos.x, 0.25*sin(min_angle) + pos.y), uv, 0.005);
if (lerpV > 0)
return lerp(col, float3(0, 0, 0), lerpV);
}
if (dis < 0.35)
{
//秒针
float lerpV = lerpLine(pos, float2(0.35*cos(sec_angle) + pos.x, 0.35*sin(sec_angle) + pos.y), uv, 0.002);
if (lerpV > 0)
return lerp(col, float3(1, 0, 0), lerpV);
}
}
if (dis < radio1) {
//内圈里
return lerp(fixed3(0, 0, 0),fixed3(0.75, 0.75, 0.75),(radio1 - dis)*500);
}
else if(dis< radio1 + width1){
//内圈边
return lerp(fixed3(0, 0, 0),fixed3(1, 1, 1),max(0,1/(radio1 + width1 - dis)*0.0008));
}
else {
float3 col = lerp(fixed3(0, 0, 0), fixed3(1, 1, 1), min(1, (radio - dis) * 200));
if (dis <= radio)
{
//外圈里
if (dis >= radio - 0.08)
{
//刻度
float2 direction = uv - pos;
float angle = acos(dot(normalize(direction), float2(1, 0)));
float angle_d = angle * 57.29577 % 30;
if (angle_d < 0.6 || angle_d>29.4)
{
//刻度长针
if (dis >= radio - 0.06)
{
if (angle_d <1)
{
return lerp(col, fixed3(0, 0, 0), min(1, (0.6 - (abs(angle_d))) / 0.5));
}
else {
return lerp(col, fixed3(0, 0, 0), min(1, ((abs(angle_d) - 29.4)) / 0.5));
}
}
}
else {
//刻度短针
if (dis >= radio - 0.04)
{
float angle_d1 = angle * 57.29577 % 6;
if (angle_d1<0.4 || angle_d1>5.6)
{
if (angle_d1 < 0.4)
{
return lerp(col,fixed3(0, 0, 0), min(1, (0.4- angle_d1) / 0.5));
}
else {
return lerp(col,fixed3(0, 0, 0), min(1, (angle_d1 - 5.6) / 0.5));
}
}
}
}
}
return col;
}
else if (dis >= radio && dis < radio + width)
{
//外圈边
return fixed3(0, 0, 0);
}
else {
//外圈外
return lerp(fixed3(0, 0, 0), backColor(uv), min(1, (dis - radio - width) * 200));
}
}
}
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = TRANSFORM_TEX(v.uv, _MainTex);
return o;
}
fixed4 frag (v2f i) : SV_Target
{
// sample the texture
fixed3 col = drawCircle(i.uv,float2(0.5,0.5),0.4,0.02,0.013,0.01);
return fixed4(col,0);
}
ENDCG
}
}
}
3：unity代码如下：
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class clock : MonoBehaviour
{
public Material mat;
public int Hour = 0;
public int Minute = 0;
public int Second = 0;
// Start is called before the first frame update
void Start()
{
mat.SetInt("hors", Hour);
mat.SetInt("mins", Minute);
mat.SetInt("secs", Second);
}
// Update is called once per frame
void Update()
{
if(System.DateTime.Now.Hour!= Hour)
{
Hour = System.DateTime.Now.Hour;
mat.SetInt("hors", Hour);
}
if (System.DateTime.Now.Minute != Minute)
{
Minute = System.DateTime.Now.Minute;
mat.SetInt("mins", Minute);
}
if (System.DateTime.Now.Second != Second)
{
Second = System.DateTime.Now.Second;
mat.SetInt("secs", Second);
}
}
}
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