Ursina Engine纹理无法适配缩放问题求助（v5.3.0）

解决纹理拉伸/间隙问题 #

以下几种方法可解决你的问题：

• 手动匹配纹理与实体缩放比例
  放弃texture_scale='mesh'，直接根据实体缩放设置texture_scale的具体数值。比如你的实体Y轴缩放2倍，若纹理为正方形，设置texture_scale=(1, 2)让纹理在Y方向重复2次，刚好适配实体尺寸，避免拉伸或间隙：

  example = Entity(model='cube', scale=(1,2), texture='stone.png', texture_scale=(1, 2))
  

  若纹理非正方形，需根据纹理宽高比调整参数，比如纹理是1:2比例，实体缩放(1,2)，则设置texture_scale=(2, 2)适配。

• 自定义UV映射
  若默认Cube的UV坐标不满足需求，可手动创建自定义Mesh，调整每个面的UV值，让纹理完全适配实体缩放：

  from ursina import *
  
  # 适配Y轴2倍缩放的自定义Cube网格
  custom_cube = Mesh(
      vertices=[(-0.5,-1,0.5), (0.5,-1,0.5), (0.5,1,0.5), (-0.5,1,0.5),
                (-0.5,-1,-0.5), (0.5,-1,-0.5), (0.5,1,-0.5), (-0.5,1,-0.5),
                (-0.5,-1,-0.5), (-0.5,-1,0.5), (-0.5,1,0.5), (-0.5,1,-0.5),
                (0.5,-1,-0.5), (0.5,-1,0.5), (0.5,1,0.5), (0.5,1,-0.5),
                (-0.5,1,-0.5), (0.5,1,-0.5), (0.5,1,0.5), (-0.5,1,0.5),
                (-0.5,-1,-0.5), (0.5,-1,-0.5), (0.5,-1,0.5), (-0.5,-1,0.5)],
      uvs=[(0,0), (1,0), (1,2), (0,2),
           (0,0), (1,0), (1,2), (0,2),
           (0,0), (1,0), (1,2), (0,2),
           (0,0), (1,0), (1,2), (0,2),
           (0,0), (1,0), (1,1), (0,1),
           (0,0), (1,0), (1,1), (0,1)],
      triangles=[(0,1,2), (0,2,3),
                 (4,5,6), (4,6,7),
                 (8,9,10), (8,10,11),
                 (12,13,14), (12,14,15),
                 (16,17,18), (16,18,19),
                 (20,21,22), (20,22,23)]
  )
  example = Entity(model=custom_cube, scale=(1,2), texture='stone.png')
  

• 显式开启纹理重复模式
  先加载纹理并开启重复，再配合texture_scale调整，确保纹理正确适配：

  from ursina import *
  
  stone_tex = Texture('stone.png')
  stone_tex.repeat = True  # 开启纹理重复
  example = Entity(model='cube', scale=(1,2), texture=stone_tex, texture_scale=(1, 2))
  

版本相关Bug说明 #

Ursina 5.3.0确实存在texture_scale='mesh'的适配问题：当实体非等比例缩放时，该参数的计算逻辑会出现偏差，导致纹理重复时出现间隙或适配不良。这个问题在后续的5.4.0及更高版本中已被官方修复，优化了非均匀缩放实体的纹理适配计算方式。

内容的提问来源于stack exchange，提问作者user22591469