ICEM Surf -Shape Diagnoses中英帮助文档

11.8.1
Shape Diagnoses – Reflection 形状分析—反射
Course of reflection and highlight lines 反射和高光线课程
Reflection lines are created with this diagnosis allowing an exact evaluation of surfaces. 用这种诊断方式创建的放射线能精确的评估曲面。
折弯不能接受。因为它们表示诊断线不连续。
The diagnostic line is continuous at the patch matching. However, not the curvature continuity at the patch edge point is decisive, but the continuous course of the curve across several patches. 已匹配片的诊断线应该是连续的。但并不由匹配边上的点是否曲率曲面上的点。由 反射角得到放射线和曲面法向。 b）在光源方向上，光线将以同样 的角度被反射。光源位于从曲面点 到指定距离的直线段上。 2.计算反射线上更多的反射点 不 a）光源会被三角化 懂 b)曲面上更多的点也会被从光源按 eye 指定的距离计算。这些点构成反射 point 线。
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Z Y X
反射分析原理 11.8.1.3 Principle of the reflection diagnosis
light source in X direction
light source in Z direction
杆状光源沿径向发出光线。每一 条光线都通过指定或计算反射在 曲面上。 反射线是条从曲面点到观察点的 一条直线。观察点由Display –
通常，放射线或高光线的正确路线由光源的位置来验证和评估。 下面的图表表示了匹配片的间隙。如果用x作为光源方向，诊断线看似连续。但是用z作为光源方向，偏置将会发生。
227
超级野猪制作
Figure 77 Dependency on the direction of the light source
SHAPE DIAGNOSES – REFLECTION
射线：入射角=反射角。
Single With this option, an individual surface point has to be determined by selection. Therefore, the angle of reflection (= angle between reflection ray and surface normal in this point) is defined. In addition, the direction of the light source and its distance from the selected surface point are specified. 这个选项要求选择曲面上的一个点，反射角也会被定义。另外，反射光源和到已选择曲面 The following steps are carried out: 点的距离也要求被指定。 1. Finding the light source 会执行以下步骤： a) Starting at the eye point, the “ray of view” (reflection ray) meets the surface point. The reflection ray and the surface normal form the angle of reflection. b) The ray is reflected with the same angle (angle of incidence) in the direction of the light source. The light source is a straight line located at the specified distance from the surface point (see figure below).
偏置的放射线指出切向或法向不规则。
每个不同的零件都有各自能接受的偏置量。诊断线的路线是决定性因素：如果 仍是连续的曲线，一小点偏置量也会被允许。
Bends within the reflection or highlight line mean tangent but no curvature continuity. 放射线或高光线的折弯表示相切但不斜率连续。 Bends cannot be tolerated. They indicate that the diagnostic line is not continuous. Continuous Course
超级野猪制作
Set The diagnoses will only be calculated on selected objects combined in a “set”. Select +
SHAPE DIAGNOSES – REFLECTION
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Objects can be selected for a new set using these buttons. The information which objects the set consists of and whether All or Set is active is passed on to the other shape diagnoses. In this way it is possible to carry out different diagnoses for the same set without having to re-select the objects each time or to change the setting of the options.
Figure 78
Finding the light source
surface normal
ray of light
放射线由曲面上的杆状光源创建。这条 路线阐明了曲面形状和曲面匹配质量。 通常来说，下面的例子非常典型：
Figure 76
Course of reflection and highlight lines
connected patches
reflection or highlight line
gap
间隙
11.8.1.1
Reflection lines are created by reflections of rod-shaped light sources on surfaces. Their course illustrates the shape of the surface and the quality of surface matchings. Generally, the following cases can be distinguished (this is also true for highlight lines, see section 11.8.2 “Shape Diagnosis – Highlight” on page 231):
View, Central Perspective来指定。
The rod-shaped light source emits rays of light in radial direction. A single ray of light is reflected on the surface in a specified or computed point. The reflection ray is a straight line starting at that surface point and passing through a determined eye point. The coordinates of the eye point can be specified via Display – View, Central Perspective (see section 12.3 “Display – View” on page 252). The angle between ray of light and surface normal represents the angle of incidence, that one between surface normal and reflection ray is the angle of reflection. The reflection law applies to the creation of reflection lines: angle of incidence = angle of reflection 放射线和曲面法向的角度表示入射角，就是反射角。反射规律将用于创建放 There are the following possibilities of creating reflection lines:
11.8.1.2
定，而是由通过几个片上的曲线的连续性来判断。 Position of the light source 点光源位置
Generally, it depends on the position of the light source, whether the correct course of the reflection or highlight line can be recognized and evaluated (see option Light Vector: X, Y, Z, Light Src., Vector). The figure below shows a patch matching with a gap. If the X direction is used as light direction, the diagnostic lines appear to be continuous. However, if the Z direction is set as light direction, an offset can be seen in the individual lines.
offset
偏置
bend
折弯
continuous course
连续
Gap Gaps between patches can mostly be recognized by an interrupted diagnostic line. 片之间的间隙通常能通过中断的诊断线发现 Offset
An offset in a reflection or highlight line shows an irregularity of a tangent or normal. The offset quantity which can be tolerated depends on the corresponding part. An irregularity in the roof area of a vehicle, e. g., would be noticed immediately, however, the same defect in a smaller part possibly not. The course of the diagnostic line is the decisive factor: a small offset can be tolerated if it is only a continuous line. Bend