From cd76d365312daf1cc4e345d72d34e743c955f845 Mon Sep 17 00:00:00 2001
From: Karlcarlo <karlcarlo@163.com>
Date: Sat, 3 Oct 2026 16:11:31 +0000
Subject: [PATCH] =?UTF-8?q?demo/bump=20v2.1=EF=BC=9A=E5=B0=8F=E8=84=9A?=
 =?UTF-8?q?=E4=B8=AB=E6=94=B9=E6=88=90=E8=B8=A2=E8=B5=B7=E8=BD=AF=E5=B8=90?=
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 demo/bump/index.html | 42 +++++++++++++++++++++++++++---------------
 1 file changed, 27 insertions(+), 15 deletions(-)

diff --git a/demo/bump/index.html b/demo/bump/index.html
index 20a6ae7..eead866 100644
--- a/demo/bump/index.html
+++ b/demo/bump/index.html
@@ -7,7 +7,7 @@
 <!-- 2026-10-03 创意预览（不进正式首页）：「整块头图是妈妈的肚皮」v2。
      头图去掉了胎儿插画（belly.jpg：原头图渐变拟合 + 一团圆鼓鼓的肚皮柔光，再叠回 LOGO/倒计时/周数/进度条）。
      WebGL 把它当一层肉肉的肚皮：
-       · 宝宝时不时从里面蹬出一只小脚印（脚掌+五个脚趾的高度场），停一会儿、扭一扭、脚趾动一动，再缩回去，隔会儿换个地方；
+       · 宝宝时不时往外蹬一脚，把肚皮连同上面的字撑成一个软软的小帐篷（顶上隐约一只圆乎乎的小脚丫），扭一扭再缩回去，隔会儿换个地方，常常专挑字踢；
        · 手指戳上去 = 肚皮被按下去一个窝，松手后像肉一样 duang duang 回弹（欠阻尼弹簧，过冲时反鼓起来）+ 周围一起晃；
        · 戳中小脚印 → 脚印「嗖」地缩回去并往远离手指的方向溜走，过一两秒在别处冒出来。
      不再有水波纹。下面的卡片是首页截图（静态），只为给头图一个真实语境。
@@ -77,7 +77,7 @@ float foot(vec2 p){
   float sole=sdE(d,vec2(1.,-6.),vec2(11.5,11.));
   sole=smin(sole,sdE(d,vec2(-1.5,6.),vec2(8.,11.)),10.);
   sole=smin(sole,sdE(d,vec2(-1.,15.),vec2(8.5,9.)),10.);
-  float hs=smoothstep(6.,-12.,sole);
+  float hs=smoothstep(8.,-14.,sole);
   // 五个脚趾，从大到小；蜷曲时往脚掌收、变矮
   float cu=G.y, ht=0.;
   vec3 toe[5];
@@ -86,13 +86,21 @@ float foot(vec2 p){
     vec3 t=toe[i]; float w=sin(Tm*9.+float(i)*1.3)*.5+.5;
     vec2 tc=t.xy+vec2(0.,(3.5+1.5*w)*cu);
     float sd=length(d-tc)-t.z;
-    ht=max(ht,smoothstep(2.5,-3.5,sd)*(.8-.25*cu*w));
+    ht=max(ht,smoothstep(4.,-5.,sd)*(.62-.18*cu*w));
   }
   return F.w*max(hs,ht);
 }
 float dentR=33.;
 float dent(vec2 p){vec2 d=p-P.xy;return P.z*exp(-dot(d,d)/(dentR*dentR));}
-float hgt(vec2 p){return foot(p)+dent(p);}
+// 小帐篷：脚丫往外蹬，把肚皮连同上面的字一起撑成一个尖顶软帐篷
+float tent(vec2 p){
+  if(F.w<.01) return 0.;
+  vec2 d=p-F.xy; float c=cos(F.z),s=sin(F.z);
+  d=vec2(c*d.x+s*d.y,-s*d.x+c*d.y); d.y*=.85;
+  float u=clamp(1.-sqrt(dot(d,d)+64.)/68.,0.,1.)/(1.-8./68.);   // 顶上磨圆，不出尖折痕
+  return F.w*2.3*pow(u,1.7);
+}
+float hgt(vec2 p){return tent(p)+foot(p)*.3+dent(p);}
 void main(){
   vec2 p=v*S;
   vec3 c0=texture2D(T,v).rgb;
@@ -108,22 +116,24 @@ void main(){
   float gw=exp(-dot(dp,dp)/(130.*130.));
   vec2 q=p+dp*(-P.z*.03)*gp - J*gw + g*2.2;
   float fh=clamp(foot(p)/12.,0.,1.);
-  q-=(p-F.xy)*.10*fh;                         // 脚印顶起处微微放大
+  float th=clamp(tent(p)/16.,0.,1.2);
+  q-=(p-F.xy)*.36*th;                         // 帐篷顶把字往外撑开、放大：越靠近顶越被撑大
   q=mix(p,q,m);
   vec3 c=texture2D(T,clamp(q/S,0.,1.)).rgb;
-  vec3 n=normalize(vec3(-g*.9,1.));
+  vec3 n=normalize(vec3(-g*.85,1.));
   vec3 L=normalize(vec3(-.45,-.75,.9));
   float dif=dot(n,L)-dot(vec3(0.,0.,1.),L);
-  c+=vec3(1.,.93,.88)*max(dif,0.)*.34;
-  c*=1.+min(dif,0.)*vec3(.42,.55,.6);        // 背光侧偏暖红，像皮肤
+  c+=vec3(1.,.95,.9)*max(dif,0.)*.30;
+  c*=1.+min(dif,0.)*vec3(.28,.36,.38);        // 背光侧偏暖红，像皮肤
   // 脚印四周一圈很淡的凹陷（皮被撑起，边上被拉紧）
   float rim=smoothstep(.0,.25,fh)*(1.-smoothstep(.25,.7,fh));
-  c*=1.-.05*rim*smoothstep(2.,8.,F.w);
   // 按下去的窝：窝底暗一点、偏红一点（像压着肉）
+  // 帐篷往右下投一层淡影，让它「立」起来
+  vec2 d0=p-F.xy-vec2(7.,11.); c*=1.-.10*exp(-dot(d0,d0)/(48.*48.))*smoothstep(1.,9.,F.w)*(1.-th);
   float dn=clamp(-dent(p)/10.,0.,1.)*m;
   c*=1.-dn*vec3(.13,.21,.2);
   vec3 Hh=normalize(L+vec3(0.,0.,1.));
-  c+=vec3(1.,.97,.95)*pow(max(dot(n,Hh),0.),36.)*.22*smoothstep(.5,4.,abs(h));  // 皮肤油润的柔高光
+  c+=vec3(1.,.97,.95)*pow(max(dot(n,Hh),0.),24.)*.12*smoothstep(.5,4.,abs(h));  // 皮肤油润的柔高光
   c+=vec3(1.,.88,.8)*smoothstep(2.,12.,h)*.05;  // 顶起处微微透亮
   gl_FragColor=vec4(c,1.);
 }`;
@@ -167,12 +177,14 @@ void main(){
   const jg = { x: { v: 0, vel: 0, to: 0, k: 210, c: 4.2 }, y: { v: 0, vel: 0, to: 0, k: 210, c: 4.2 } };
   let mode = 'wait', wait = .5, t = 0, count = 0;
 
+  const TEXT_SPOTS = [[62, 120], [100, 74], [104, 124], [96, 166], [230, 26], [160, 168]];
   function pickSpot() {
     for (let i = 0; i < 40; i++) {
-      // 落在右半边空白肚皮上（原来画宝宝的地方），偶尔窜到左下角；不压在大字和胶囊上
-      const x = 40 + Math.random() * 300, y = 78 + Math.random() * 108;
-      if (x < 225 && y < 188) continue;
-      if (Math.hypot(x - ft.x, y - ft.y) > 70) return { x, y };
+      // 一半概率专挑字踢（大字「30」、倒计时胶囊、进度条、slogan），字会被撑起来变形；一半落在右边空白肚皮
+      let x, y;
+      if (Math.random() < .55) { const s = TEXT_SPOTS[Math.floor(Math.random() * TEXT_SPOTS.length)]; x = s[0] + (Math.random() - .5) * 16; y = s[1] + (Math.random() - .5) * 10; }
+      else { x = 240 + Math.random() * 100; y = 80 + Math.random() * 100; }
+      if (Math.hypot(x - ft.x, y - ft.y) > 80) return { x, y };
     }
     return { x: 300, y: 120 };
   }
@@ -195,7 +207,7 @@ void main(){
     if (on) {
       pk.x = x; pk.y = y; pk.held = true; pk.d.to = -14; pk.d.k = 380; pk.d.c = 22;
       const fx = ft.x + ft.ox, fy = ft.y + ft.oy;
-      if ((mode === 'show' || (mode === 'hide' && ft.h.v > 3)) && Math.hypot(x - fx, y - fy) < 46) {
+      if ((mode === 'show' || (mode === 'hide' && ft.h.v > 3)) && Math.hypot(x - fx, y - fy) < 58) {
         // 戳中小脚丫：嗖地缩回去，往远离手指的方向溜
         count++;
         let dx = fx - x, dy = fy - y, l = Math.hypot(dx, dy);