voldemort@Posted: Wed Jun 07, 2006 4:51 am : <div class="postbody">Tutorial Tip how to create a mask effect in doom 3
<br /><br />I stumbled on this little masking trick when after I had created a model of a ornate cross and textured it and then make a 2d picture of it
<br />I saved it as a trasparent tga so only the cross would show up
<br />I then had the bright Idea to try to make blood flow around and over it by simply adding the stages of flowing blood   to my surprise the cross acted like a mask and the blood only appeared on the cross itself nowhere else
<br /><br />so I tested this masking technique as a true mask I made a ring shape and made it black and then the light black as well so that the texture was absolutly black but still had a trasparent background
<br />then I added this mtr
<br /><br /><div class="codetitle"><b>Code:</b></div><div class="codecontent">textures/exhale2/mask_test3<br />{<br />   twosided<br />   noshadows<br />   noselfshadow<br />   DECAL_MACRO<br />   <br /><br />   {<br />      forceHighQuality<br />      blend diffusemap<br />      map       textures/learning/tst3.tga<br />      alphatest 0.5<br />      <br />   }<br /><br /><br />   {<br />      blend         add<br />      map            textures/decals/blood_drip1<br />      translate      1,time*-0.1<br />      rgba 0.2<br />      <br />   }<br />   {<br />      blend         add<br />      map            textures/decals/blood_drip1a<br />      translate      1,time*-0.02<br />      rgba 0.2<br />   }<br />}</div>
<br /><br /><br />and it works I had blood flowing ounly in the ring the rest of the square texture has nothing in it
<br /><br />I then made a  series of rivulets (vein structures) the same way and made them tileable and then added a translate parm so they scrolled and it worked I had rivulets of blood flowing in this manner quite nice effect   now I the onlything to do is modify the blood so that the whit is hidden
<br /><br />still havnt quite worked that one out yet but its a nice start 
<br /><br />anyone else know how to create masks like this Alternative methods would be apprecieated</div><br><hr><br/>voldemort@Posted: Wed Jun 21, 2006 3:03 pm : <div class="postbody">just additional fun
<br /><br />lets say you want a jiggling or quivering mass of goo
<br />create the base mask (yoiur blob with tentacles)
<br /><br />then add a shear or centerscale stage parm with a table
<br />examples
<br />shear flo1Table [ time * -0.05 ], 0.5
<br /><br />or 
<br />centerScale (.924 + fol1Table[time / 95]), (.924 + fol1Table[time / 95])
<br /><br />the numbers will vary in my case for the texture in question I needed a odd number like .924 to look right
<br /><br />the degree of alphatest determines how much of your mask will show up
<br /><br />examples 0.9 (very little)  0.0000001 ( the whole enchilada)</div><br><hr><br/>voldemort@Posted: Wed Jun 21, 2006 3:06 pm : <div class="postbody">forgot to mention for stages that you want to ignore the alphatest stage its preaty simple i allready said how  the stage parm
<br /><br />ignoreAlphaTest
<br />and magic its ignored
<br />works well with blend filter stages</div><br><hr><br/>