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Light illumination model and computer-aided design


I M point in the arc, its reflected light of the region according to the test screen I one. ; When the M point in the arc Ⅳ, its reflected light of the region according to a Ⅳ. MI. After discussion on the horizontal line AB B,, C, C point falls area were I, Ⅱ, I, Ⅳ in the possibility of: (1) reflecting on the arc light on the I: as. ∈ (- 8.045,0), no light shine B, C; when. ∈ (a 13.35, a 8.045], there is a light shine, but not the light shine on C; when. ∈ (a 3O, a 13.351, respectively, there is a light shine, C., (2) reflecting on the arc light on Ⅳ: When. ∈ (a 13.31, O), no light shine, C; when. ∈ (a 3O, a 13.351, there is a light shine B. (3) reflecting on the arc light on the I: as. ∈ (a 0.799,0), the absence of light shine on B, C points; when o ∈ (a 1.578, a 0.7791 time , there is a light shine on point B, but no points of light shine C; when. ∈ (a 3O, a 1.578], respectively, shine a light point B and C points. (4) on the arc I reflected light: when. ∈ (a 0.779,0), the absence of light shine on B, C; when z. ∈ (a 1.578, a O.779], because point B can not make too just over the P (z., O) of the parabolic normal, so there is no light shine B,[link widoczny dla zalogowanych], C points; when. ∈ (a 3O, a 1.578], respectively, shine a light point B and C point. So to meet the specification to the following conditions: C point intensity rating of not less than one (ie, reflected light from the point to C), B point of the light intensity is not less than 2 times the rated value, then half the linear light source, ÷ ∈ (o.779, 13.35). by the P point of the light emitted by different points on the M parabolic reflector, the reflected light intensity is different, the light intensity and the square of IPMI inverse, but with a different point of IPMI IPMI M or less corresponds to, it can use the following approach: first that the intensity of the reflected light approximately the same, so a point on the test screen, the intensity of the light source on a line a length proportional to the point of the segment by the reflection of light can be issued according to the first point (if 2 shine on that point, its length is able to shine on that point and the length of time), in this condition l can be obtained under the rough value. and then consider the intensity of the reflected light of different, find the precise l, further taking into account the actual situation, the line length of the light source is not very long, in this specific case, it may take l maximum value of 3O, that is, P (xo, O), to meet the IoI ≤ 15. In summary, the following conclusions can be drawn: to meet the conditions given problem set: C point, no, no smaller than a certain light intensity a rating (that is, all reflected light to the C point), B point of the light intensity of not less than the rating of 2 to 16 t-wei, Ho lights lighting model and computer-aided design 75 times, the line light source half the length ÷ ∈ (1.57815). in front of the reflected light intensity according to the approximate treatment and light intensity and the relationship between the length of line source, that is the same for all the intensity of the reflected light, so when the meet the following relationship :1.578 - 0.779 +2 (/ - 1.578) = 4 (/ - 1.578), solve for z a 3.935, that is, when z a 3.935 point B just as the light intensity of light C 2 times the strength to meet the practical requirements of .4 highlights of reflected light by the light source in accordance with the above points P and Q test points on the screen relationship between the coordinate functions, in order to show that the test screen brightness changes on the trend of light paraboloid of revolution can be obtained after the discretization of a light reflective screen in the bright reflected light zones (Figure 3). After a coordinate translation available when the car after the two headlamps are lit reflective screen when reflected light of the bright area on the map. The more points the figure represents the stronger light. Fig. 3 single lamp in the test area on the screen light reflection [2] Lidong Jiang, modern automotive electrical equipment [M]. Beijing: China Machine 1 - Industry Press