水晶蓝莲花（Matlab实现）

0 冰清玉洁

雨打梨花，打不落那份冰清玉洁的品质，昨晚下雪啦，我想着：

今朝若是同淋雪，此生也算共白头。

但是总感觉还差点什么，想着想着，此时的冰花雪莲能带来雪后的浪漫，心里就想弄出一朵冰花雪莲，首先赋诗一首，再代码奉上：

** 冰山雪莲**

冰封大地银，山崖峭壁静。

*雪梅傲有情，莲藕互通心*。 **

冰封松柏青，花香留我情。

1 代码

function crystall

hold on
for i=1:50
    len=rand(1)*8+5;
    tempV=rand(1,3)-0.5;
    tempV(3)=abs(tempV(3));
    tempV=tempV./norm(tempV).*len;
    tempEpnt=tempV;
    drawCrystal([0 0 0],tempEpnt,pi/6,0.8,0.1,rand(1).*0.2+0.2)
    disp(i)
end
ax=gca;
ax.XLim=[-15,15];
ax.YLim=[-15,15];
ax.ZLim=[-2,15];
grid on
ax.GridLineStyle='--';
ax.LineWidth=1.2;
ax.XColor=[1,1,1].*0.4;
ax.YColor=[1,1,1].*0.4;
ax.ZColor=[1,1,1].*0.4;
ax.DataAspectRatio=[1,1,1];
ax.DataAspectRatioMode='manual';
ax.CameraPosition=[-67.6287 -204.5276   82.7879];
end

function drawCrystal(Spnt,Epnt,theta,cl,w,alpha)
       %plot3([Spnt(1),Epnt(1)],[Spnt(2),Epnt(2)],[Spnt(3),Epnt(3)])
       mainV=Epnt-Spnt;
       cutPnt=cl.*(mainV)+Spnt;
       cutV=[mainV(3),mainV(3),-mainV(1)-mainV(2)];
       cutV=cutV./norm(cutV).*w.*norm(mainV);
       cornerPnt=cutPnt+cutV;
       cornerPnt=rotateAxis(Spnt,Epnt,cornerPnt,theta);
       cornerPntSet(1,:)=cornerPnt';
       for ii=1:3
           cornerPnt=rotateAxis(Spnt,Epnt,cornerPnt,pi/2);
           cornerPntSet(ii+1,:)=cornerPnt';
       end
       for ii=1:4
           jj=mod(ii,4)+1;
           fill33(Spnt,cornerPntSet(ii,:),cornerPntSet(jj,:),alpha)
           fill33(Epnt,cornerPntSet(ii,:),cornerPntSet(jj,:),alpha)
       end
end

function fill33(p1,p2,p3,alpha)
        fill3([p1(1),p2(1),p3(1)],[p1(2),p2(2),p3(2)],[p1(3),p2(3),p3(3)],...
            [0 71 177]./255,'FaceAlpha',alpha,'EdgeColor',[0 71 177]./255.*0.8,'EdgeAlpha',0.6,...
            'EdgeLighting','gouraud','SpecularStrength',0.3)
        
end

function newPnt=rotateAxis(Spnt,Epnt,cornerPnt,theta)
        V=Epnt-Spnt;V=V./norm(V);
        u=V(1);v=V(2);w=V(3);
        a=Spnt(1);b=Spnt(2);c=Spnt(3);
        cornerPnt=[cornerPnt(:);1];
        
        rotateMat=[u^2+(v^2+w^2)*cos(theta)       ,  u*v*(1-cos(theta))-w*sin(theta),  u*w*(1-cos(theta))+v*sin(theta),  (a*(v^2+w^2)-u*(b*v+c*w))*(1-cos(theta))+(b*w-c*v)*sin(theta);
                   u*v*(1-cos(theta))+w*sin(theta),  v^2+(u^2+w^2)*cos(theta)       ,  v*w*(1-cos(theta))-u*sin(theta),  (b*(u^2+w^2)-v*(a*u+c*w))*(1-cos(theta))+(c*u-a*w)*sin(theta);
                   u*w*(1-cos(theta))-v*sin(theta),  v*w*(1-cos(theta))+u*sin(theta),  w^2+(u^2+v^2)*cos(theta)       ,  (c*(u^2+v^2)-w*(a*u+b*v))*(1-cos(theta))+(a*v-b*u)*sin(theta);
                   0                              ,  0                              ,  0                              ,  1];
        
        newPnt=rotateMat*cornerPnt;
        newPnt(4)=[];
end

3 浪漫邂逅——冰山雪莲

  ![](https://img-blog.csdnimg.cn/1ed8184e621341398fb83f72ac96f147.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5piv5qKm5ZCn77yM5piv5L2g5ZCn77yB,size_14,color_FFFFFF,t_70,g_se,x_16)

4 展望

                    ![](https://img-blog.csdnimg.cn/0093e54e65e84f65828c0aeff20dc68e.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5piv5qKm5ZCn77yM5piv5L2g5ZCn77yB,size_8,color_FFFFFF,t_70,g_se,x_16)