In article <3904F3D5.CF178365@pacbell.net>, lin### [at] povrayorg 
wrote:

> So if I had an object at <-1,0,-1> the inverse tranformation would now
> locate the object to <1,0,1> ?

No. The inverse transform moves the point in a way that would undo the 
transform. The inverse transform of "translate <-1, 0,-1>" would be 
"translate < 1, 0, 1>", but the point being transformed doesn't matter.
The inverse of rotate x*45 is rotate -x*45, the inverse of scale 0.5 is 
scale 2, and I don't feel like trying to invert a matrix right now. It 
gets more complex with multiple transforms in a row, I think you have to 
reverse each one and also reverse their order. The inverse transform 
patch makes this juggling of transforms unnecessary.

-- 
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/

Post a reply to this message