[Kazan]

Gnudson's code: [translated to my varaible types... but his math is the same still]

vector FigureNormal(apvector Verts, int index1, int index2, int index3)
{
vector v1, v2, ret;


v1.x = Verts[index1].x - Verts[index2].x;
v1.y = Verts[index1].y - Verts[index2].y;
v1.z = Verts[index1].z - Verts[index2].z;

v2.x = Verts[index2].x - Verts[index3].x;
v2.y = Verts[index2].y - Verts[index3].y;
v2.z = Verts[index2].z - Verts[index3].z;
   
ret.x = (v1.y * v2.z) - (v1.z * v2.y);
ret.y = (v1.z * v2.x) - (v1.x * v2.z);
ret.z = (v1.x * v2.y) - (v1.y * v2.x);

return ret;

}


My Code: [used his code and checked his work against documentation]

vector FigureNormal(apvector Verts, int index1, int index2, int index3)
{
vector v1, v2, ret;

/*
C.x = A.y*B.z - A.z*B.y;
C.y = A.z*B.x - A.x*B.z;
C.z = A.x*B.y - A.y*B.x;

I found Cross some information on the net on how to do this.. he crossed some things
*/

v1.x = Verts[index1].x - Verts[index2].x;
v1.y = Verts[index1].y - Verts[index2].y;
v1.z = Verts[index1].z - Verts[index2].z;

v2.x = Verts[index3].x - Verts[index2].x;
v2.y = Verts[index3].y - Verts[index2].y;
v2.z = Verts[index3].z - Verts[index2].z;

   
ret.x = (v1.y * v2.z) - (v1.z * 2.y);
ret.y = (v1.z * v2.x) - (v1.x * 2.z);
ret.z = (v1.x * v2.y) - (v1.y * 2.x);

return ret;

}


[edit]index1-index2, index3-index2, instead of index2-index1, index3-index2 - thanks Eternal one [he knows mobe about this than me][/edit]


he wasn't getting vectors with a common start point so they didn't form a plane so the normals corrupting and being weird angles isn't suprising

------------------
FreeSpace 2: The Babylon Project Effects Nerd and Programmer.
http://freespace.volitionwatch.com/babylon

Did you say you wanted your head used as a soccer ball?

[This message has been edited by Kazan (edited 04-08-2001).]

[Jabu]

Kazan's back  

[Kazan]

you think  

------------------
FreeSpace 2: The Babylon Project Effects Nerd and Programmer.
http://freespace.volitionwatch.com/babylon

Did you say you wanted your head used as a soccer ball?

[The Claw]

 

you think

Nah

------------------
"Supernova, ya supernova, supernova goes pop
supernova, ya think it's over but the supernova don't stop" PM5K
Death:"Arnold Judas Rimmer... your life is over. You will travel with me to the-"
#knees death in the groin#
Rimmer:"Remember matey, it's only the good that die young"
Kudoth, god of pointless educational programs.

[Arnav]

Yup oyah that code made a lot of sense to me!

[Shrike]

Well I'm not sure what it means, but it's handy.....

[Kazan]

It's the math which figures this [ http://www.phy.syr.edu/courses/java-suite/crosspro.html  ]  out - the function name "FigureNormal" is literal

i just noticed that the template tags which are "<" and ">" got removed with their contents from apvector"<"vector">" on the function definitions

------------------
FreeSpace 2: The Babylon Project Effects Nerd and Programmer.
http://freespace.volitionwatch.com/babylon

Did you say you wanted your head used as a soccer ball?

[This message has been edited by Kazan (edited 04-08-2001).]

[Kazan]

for the calculus http://www.physics.uoguelph.ca/tutorials/torque/Q.torque.cross.html

------------------
FreeSpace 2: The Babylon Project Effects Nerd and Programmer.
http://freespace.volitionwatch.com/babylon

Did you say you wanted your head used as a soccer ball?

[Shrike]

No mentioning calculus or I own this thread.  I have a calc 154 final tomorrow.  

[Kazan]

hehe.. I've got pre calc work to do.. 3 or 4 assignments by tommorow. OH S*** I just remembered my fragging LA assignemnt F*** I have to get that rough draft done or I lose 2/5th of the assignment points automatically! F***!

------------------
FreeSpace 2: The Babylon Project Effects Nerd and Programmer.
http://freespace.volitionwatch.com/babylon

Did you say you wanted your head used as a soccer ball?

[Bobboau]

well I guess he isn't going to get PCS done today  

------------------
Bobboau, bringing you products that work.............. in theory

[Kazan]

nor within the next month.. it's not easy

------------------
FreeSpace 2: The Babylon Project Effects Nerd and Programmer.
http://freespace.volitionwatch.com/babylon

Did you say you wanted your head used as a soccer ball?

[NeoHunter]

I don't understand a word or number or formmula Kazan wrote there. Probably that's why I suck at Maths and Calculas.

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[Bobboau]

its the cross product, it is used to find the normals for a polygon, beond that I don't know, as I have only a vage understanding of C++.

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Bobboau, bringing you products that work.............. in theory

[Kazan]

eternal observed that while my function _should_ work it will return 0 vectors, and well i saw this about 50% of the time.. hopefully eternal plays with it some more and tell's me more.. he understands this more than me

------------------
FreeSpace 2: The Babylon Project Effects Nerd and Programmer.
http://freespace.volitionwatch.com/babylon

Did you say you wanted your head used as a soccer ball?

[The Claw]

Hey, Kazan, if it's not too much trouble, can I ask that the next bit of codey-writing stuff u do for PCS is the .3ds to .pof conversion?
And just out of interest, how are you going to allow sub-onjects from a 3ds file, if you see what i mean?

------------------
"Supernova, ya supernova, supernova goes pop
supernova, ya think it's over but the supernova don't stop" PM5K
Death:"Arnold Judas Rimmer... your life is over. You will travel with me to the-"
#knees death in the groin#
Rimmer:"Remember matey, it's only the good that die young"
Kudoth, god of pointless educational programs.

[Kazan]

I was thinking about 3ds to pof.. but since i don't use it i'll prolly not write the conversion myself [maybe someone else can write it and ill put it in the program].

a) i don't use it
b) i don't know about it [see 1]


------------------
FreeSpace 2: The Babylon Project Effects Nerd and Programmer.
http://freespace.volitionwatch.com/babylon

Did you say you wanted your head used as a soccer ball?

[Fineus]

It would be nice if you could write a 3DS to pof (or a LW to pof), It sure would save people a lot of time when making models... but I see what you mean about not using/knowing much about it.

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[The Claw]

Maybe each seperate mesh could be a sub-object. It would sure beat the hell outta having to glue lights to everything, which I still havn't figured...

------------------
"Supernova, ya supernova, supernova goes pop
supernova, ya think it's over but the supernova don't stop" PM5K
Death:"Arnold Judas Rimmer... your life is over. You will travel with me to the-"
#knees death in the groin#
Rimmer:"Remember matey, it's only the good that die young"
Kudoth, god of pointless educational programs.

[Bobboau]

the light thing is becase TS don't have no parent child system, it just has siblings, so to make a turret a subobject of the hull you have to make it a subobject of another object (the turret and a light, and abstract object) and make that object a sibling to the hullso you don't make it the child of the hull you make it the child of a sibling to the hull.

hope that cleared everything up for you  

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