python 3D模块 ursina

gaohaikuo1

显示一个方块

1. from ursina import *
   
2. app=Ursina()
   
3. cube=Entity(model="cube")
   
4. app.run()

复制代码

gaohaikuo1

如果想要载入已有的3d模型可以用下面的格式（这种obj格式的文件可以下载任意3d模型后用3dmax打开）

1. cube = Entity(model = 'toybear.obj', color = color.white, scale=(.02,.02,.02), texture='toybearcolor')

复制代码

gaohaikuo1

用ursina开发一个打乒乓球的游戏

1. from ursina import *
   
2. import random as rd
   
3. 
   
4. scorea=scoreb=0
   
5. 
   
6. def update():
   
7.     global dx,dz,scorea,scoreb
   
8.     paddle_B.x-=held_keys["left arrow"]*time.dt
   
9.     paddle_B.x+=held_keys["right arrow"]*time.dt
   
10.     paddle_A.x-=held_keys["a"]*time.dt
    
11.     paddle_A.x+=held_keys["d"]*time.dt
    
12.     if paddle_A.x>0.35:
    
13.         paddle_A.x=0.35
    
14.     elif paddle_A.x<-0.35:
    
15.         paddle_A.x=-0.35
    
16.     if paddle_B.x>0.35:
    
17.         paddle_B.x=0.35
    
18.     elif paddle_B.x<-0.35:
    
19.         paddle_B.x=-0.35
    
20.     ball.x+=dx*time.dt
    
21.     ball.z+=dz*time.dt
    
22.     t.text=f"Player A : Player B  {scorea} : {scoreb}"
    
23.     hit_info=ball.intersects()
    
24.     if hit_info.hit:
    
25.         if hit_info.entity==paddle_A:
    
26.             dz=-dz
    
27.             if dz>-0.05:
    
28.                 dz-=rd.uniform(0.1,0.3)
    
29.             else:
    
30.                 dz-=rd.uniform(-0.05,0.2)
    
31.         if hit_info.entity==paddle_B:
    
32.             dz=-dz
    
33.             if dz<0.05:
    
34.                 dz+=rd.uniform(0.1,0.3)
    
35.             else:
    
36.                 dz+=rd.uniform(-0.05,0.2)
    
37.     if abs(ball.x)>0.4:
    
38.         dx=-dx
    
39.     if ball.z>0.25:
    
40.         scoreb+=1
    
41.         ball.x=0
    
42.         ball.z=-0.2
    
43.         dx=rd.uniform(-0.4,0.15) if rd.randint(0,1)==0 else rd.uniform(0.15,0.4)
    
44.         dz=rd.uniform(-0.5,0.2) if rd.randint(0,1)==0 else rd.uniform(0.2,0.5)
    
45.     if ball.z<-0.65:
    
46.         scorea+=1
    
47.         ball.x=0
    
48.         ball.z=-0.2
    
49.         dx=rd.uniform(-0.4,0.15) if rd.randint(0,1)==0 else rd.uniform(0.15,0.4)
    
50.         dz=rd.uniform(-0.5,0.2) if rd.randint(0,1)==0 else rd.uniform(0.2,0.5)
    
51. 
    
52. app=Ursina()
    
53. 
    
54. window.color=color.cyan
    
55. 
    
56. table=Entity(model="cube",color=color.orange,scale=(10,0.5,14),position=(0,0,0),texture="white_cube")
    
57. 
    
58. paddle_A=Entity(parent=table,color=color.black,model="cube",scale=(0.2,0.03,0.05),position=(0,3.7,0.22),collider="box")
    
59. paddle_B=duplicate(paddle_A,z=-0.62)
    
60. 
    
61. t=Text(text=f"Player A : Player B  {scorea} : {scoreb}", position=(-0.85, 0.45), scale=2,color=color.orange)
    
62. 
    
63. camera.position=(0,15,-26)
    
64. camera.rotation_x=30
    
65. 
    
66. Text(text="Player A",scale=2,position=(-0.1,0.32),color=color.orange)
    
67. Text(text="Player B",scale=2,position=(-0.1,-0.4),color=color.orange)
    
68. 
    
69. line=Entity(parent=table,model="quad",scale=(0.88,0.2,0.1),position=(0,3.5,-0.2))
    
70. ball=Entity(parent=table,model="sphere",color=color.gold,scale=.05,position=(0,3.7,-0.2),collider="box")
    
71. 
    
72. dx=rd.uniform(-0.4,0.15) if rd.randint(0,1)==0 else rd.uniform(0.15,0.4)
    
73. dz=rd.uniform(-0.5,0.2) if rd.randint(0,1)==0 else rd.uniform(0.2,0.5)
    
74. 
    
75. app.run()
    

复制代码

gaohaikuo1

上述代码可以学到很多东西
1.按键检测用   held_keys["left arrow"]
2.碰撞检测则用
hit_info=ball.intersects()
    if hit_info.hit:
        if hit_info.entity==paddle_A:
3.物体移动和旋转 可以直接在update完成

gaohaikuo1

entity实体的运动要靠update函数里更新实体的 x ,y ,z ,rotation_x,rotation_y,rotation_z来实现
旋转的中心点是在entity 的origin属性里进行定义