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<h1 class="declaration">procedure sbplnt</h1>
<p>
This subroutine plots a diffusively-lit, semi-transparent, coloured plane; the use must ensure that all the verticies lie in a flat plane, and that the bounding polygon be convex (so that the angle at any vertex <= 180 degs). All (x,y,z) values are taken to be given in world coordinates. The z-component of the eye-poisition should be positive and that of the vertices should be negative; the viewing-screen is fixed at z=0.
<br><br><b><font size=+2>Syntax</font></b><br>
sbplnt EYE,NV,VERT,IC1,IC2,LIGHT,ITRANS
<br><br><b><font size=+2>Arguments</font></b><br>
<table CELLSPACING=0 CELLPADDING=0 WIDTH="100%">
<tr VALIGN=TOP><td nowrap>ARGUMENT </td>
<td> TYPE I/O DIMENSION DESCRIPTION</td></tr>
<tr VALIGN=TOP><td nowrap>EYE: </td>
<td> R*4 I 3 (x,y,z) coordinate of eye-position.</td></tr>
<tr VALIGN=TOP><td nowrap>NV: </td>
<td> R*4 I - No. of verticies (>=3).</td></tr>
<tr VALIGN=TOP><td nowrap>VERT: </td>
<td> R*4 I 3 x NV (x,y,z) coordinate of verticies.</td></tr>
<tr VALIGN=TOP><td nowrap>IC1,IC2: </td>
<td> I*4 I - Lowest & highest colour-index to be</td></tr>
<tr VALIGN=TOP><td nowrap> </td>
<td> used for the shading.</td></tr>
<tr VALIGN=TOP><td nowrap>LIGHT: </td>
<td> R*4 I 3 (x,y,z) direction of flood-light.</td></tr>
<tr VALIGN=TOP><td nowrap>ITRANS: </td>
<td> I*4 I - Level of transparency:</td></tr>
<tr VALIGN=TOP><td nowrap> </td>
<td> 1 = 25%; 2 = 50%; 3 = 75%.</td></tr>
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Copyright © Thomas Ott ---- DPUSER - The Next Generation 3.3 (Rev. )
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