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颗粒油漆切线夹

粒子工具（“平滑”，“涂抹”，“移动”，“捏”，“切线捏”，“旋转”和“展平”）可修改点云中的粒子位置。就像雕刻工具可以塑造曲面一样，粒子工具甚至可以单独控制，定位和引导粒子，以产生所需的结果。粒子可以是任意数量的东西：具有单点顶点的网格层或单点多边形（也称为点云）的集合。有几种创建点云的方法，但是最直接的方法是使用粒子绘画工具。

注意：  您无法使用粒子工具修改程序生成的粒子，例如粒子云或一个粒子发生器。

使用工具

粒子工具位于Paint界面标签下的Particle Tools工具箱的子标签。选择工具后，其属性将显示在Properties视口。首次选择该工具时，它具有Smooth Brush作为默认画笔笔尖。您可以在继续操作之前选择替代的笔刷笔尖，或在3D视口中单击鼠标右键以缩放笔刷大小。在视口中拖动以影响粒子。切线收缩工具将粒子聚集到笔刷的中心。的Tangent Pinch Amount确定它们移动的速度。紧迫Ctrl通过向外传播粒子（远离笔刷中心）来消除工具的效果。

Particle: Tangent Pinch

Pinch Amount

Controls the strength of the pinching, which is essentially the speed at which the affected particles move inward or outward.

Brush Constraint

Controls what area within the volume is affected by the brush when you paint into a volume of particles from a 2D viewport. (You can only view the 3D elements in the flat 2D space of the screen.)

• Closest Particle - Affects the particle(s) closest to the viewport camera (closest to you).

• Grid - Affects the particle(s) closest to the Work Plane grid.

• Center Particle - Affects the particle(s) closest to the center of the volume under the brush.

Particle Constraint

When enabled, constrains each individual vertex against any foreground polygons to ensure the vertex always rests on a polygon's surface as it moves. Works in the same manner as the Constrain to Background - Point mode, but this is not dependent upon background geometry.

小费：  When working with the Particle Constraint option, the constraining geometry doesn't have to be in the same layer as the point cloud. You can press Ctrl as you select additional item layers to bring them into the foreground. The edited particles conform to the foreground polygon's surface but remain within their initial layer.

Screen Brush

When enabled, flattens the particle volume so that all particles through the volume are affected by the brush, regardless of how close or distant they are. When disabled, the volume of the brush tip in 3D space is a fixed size and only affects the particles within this volume (as defined by the Brush Constraint option). Particles that are further away in the volume are not affected even though the brush is passing over them.