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### #ActualDemx

Posted 02 September 2013 - 04:00 AM

hi, I'm reading the book Mathematics for 3d game programming and computer graphics, and got a doubt in the mentioned section ( page 362 ). It says the distance between a point P ( center of sphere ) and L ( defined as < N, D > ) can be defined as

L*P = r.

Then the book says the relationship can also be written as

N*P + D = r.

Is this correct? Shouldn't it really be N*P - D = r? Thanks

### #3Demx

Posted 02 September 2013 - 03:59 AM

hi, I'm reading the book Mathematics for 3d game programming and computer graphics, and got a doubt in the mentioned section ( page 362 ). It says The relationship between a point P ( center of sphere ) and L ( defined as < N, D > ) can be defined as

L*P = r.

Then the book says the relationship can also be written as

N*P + D = r.

Is this correct? Shouldn't it really be N*P - D = r? Thanks

### #2Demx

Posted 02 September 2013 - 03:58 AM

hi, I'm reading the book Mathematics for 3d game programming and computer graphics, and got a doubt in the mentioned section ( page 362 ). It says The relationship between a point P ( center of sphere ) and L ( plane ) can be defined as

L = [ N, D ].

I assume N is normal and D is distance from origin. Then the book says the relationship can also be written as

N*P + D = r.

Is this correct? Shouldn't it really be N*P - D = r? Thanks

### #1Demx

Posted 02 September 2013 - 03:57 AM

hi, I'm reading the book Mathematics for 3d game programming and computer graphics, and got a doubt in the mentioned section ( page 362 ). It says The relationship between a point P ( center of sphere ) and L ( plane ) can be defined as L = [ N, D ]. I assume N is normal and D is distance from origin. Then the book says the relationship can also be written as N*P + D = r. Is this correct? Shouldn't it really be N*P - D = r? Thanks

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