[csu540-f05-rpf] [csu540-f05] SP3 question

[Philip Lee]

Robert Futrelle wrote:
> I'll answer you in about an hour, soon as I get home.
> 
>    rpf
> 
> 
>> I have a quick question. When you do the ray trace and your ray hits a 
>> point in a triangle, how do you get the z-coordinate of that point? I 
>> am having difficulties trying to ray trace back to the light source 
>> from a point on a triangle.
>>
>> Thanks.
>>
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I got the coordinates now, but  I got another problem. Everything seems 
to get only ambient light. I really don't know why this is happening.