Realtime 3d rendering pipeline

[ferdymania]

hi
i have just summarised a whole bunch of algorithms
of 3d Graphics rendering pipelines.

http://www.video-animation.com/flash3d_003.shtml

steve

[03ricr]

how far do u think u will go with your 3d engine?

[ferdymania]

i really dont know..

i have to implement a camera..
fix the lighting..
frustum culling..
texture on faces..
collision detection..

that should keep me off the streets for a while..
:-)
steve

[03ricr]

ahh.. well i guess once u work out your camera you will now the PointOfView..

from thereu can use my method if u want (i think its pretty quick). It was from he last thread, you find the pov unit vector and the point of an object (so its a vector too), then u find the dot product (..scalar..i forget.. im lazy) to get and angle value and if the angle value is less than, say 50 then u include it. As i said before it doesnt cull whats behind (as its like 2 cones) so you need near cliping code as well.. and you'll need to make the angle a bit bigger than the FOV/2 becuase it has to include the whole window around the circle/cone projection.

collision will be possible but a lota code.. will it slow things down at all though?

texturing seems hard. how will u do that? through transforms?

[ferdymania]

hi o
thanks for the offer of the code..i will have a look at it..
i have no idea about collision detection in 3d
but i better learn fast.. and i think it probably will be expensive..
but maybe if you use bounding boxes, then it might cut it down heaps..
but again i dont know how to do them yet...
and again for textures,, i have no idea how to do them..

i cant do anything !!! LMAO...
i guess i will tackle each hurdle as i come to it..
i am porting a C engine to flash at the moment..
and pulling it apart to see how it ticks and putting it
back together in flash..
i might learn the above questions in the process..
i hope to..
see ya
steve

[03ricr]

could you email me that c++ 3d engine please?

[deamothul]

hiya F

[ferdymania]

hey d:
what ya up to?
steve

[deamothul]

hehe, same old same old

i've been playing a bit with vectors and forces lately and still trying to understand the lighting pieces

seeYa mate

[ferdymania]

hi d:
lighting is basically the angle between the plane normal and
the line from the light to the plane..
so if the angle is 90 degrees the lighting is max and if it is
0 or 180 , then it is 0 or min ..
everything else will be backface culled..
the trick is how to make the colors brighter and darker..
that is the part i havent got sussed yet..
i think maybe
have a base color say,, rgb(200,100,100)..
then the remainder percent gets darkened or lightened...
hmmm maybe... i dont get it either.. LOL..
but then maybe just have the above in percentage of the brightness..

e.g. 1.0 or 100% = 200 red etc..
.5 or 50% might be rgb(100,50,50). ????
that seems the best..
still not right... you need to preserve the ratio between
r, g, b....
how do you do that ??
bloody maths...
seey a s
teve

[deamothul]

Originally posted by ferdymania
hi d:
lighting is basically the angle between the plane normal and
the line from the light to the plane..
so if the angle is 90 degrees the lighting is max and if it is
0 or 180 , then it is 0 or min ..
everything else will be backface culled..

i see Steve, thanks mate, again a little piece closer to the real deal

Originally posted by ferdymania

the trick is how to make the colors brighter and darker..
that is the part i havent got sussed yet..
i think maybe
have a base color say,, rgb(200,100,100)..
then the remainder percent gets darkened or lightened...
hmmm maybe... i dont get it either.. LOL..
but then maybe just have the above in percentage of the brightness..
e.g. 1.0 or 100% = 200 red etc..
.5 or 50% might be rgb(100,50,50). ????
that seems the best..
still not right... you need to preserve the ratio between
r, g, b....
how do you do that ??
bloody maths...

true mate, thats still a great idea i'll also have a stare at the lighting again this evening(hehe just like everyday almost this week), but i doubt if i'll make any progress....i suck at this
i keep going in circles, hehe, gotta love it
like ya said .. bloody math bigtime.

seeYa laterz mate

[ferdymania]

sorry..
the angle would be 0 degrees with the normal..
or 90 degrees to the plane... doh !
you know what i mean...
doh !

[deamothul]

hehe, i know what ya mean

[03ricr]

did you look at my code for lighting?

to make the colour brighter or darker i just * by the intensity of the light.

like; red = red_face * intensity;
and for green and blue..

where intensity is 0->1;

also.. for volumetric fade off.. i just calculate the new intensity with respect to the distance..

u know.. the formula i = k/(d*d);

i should be posting my newer code soon

[deamothul]

you know your stuff mate

[ferdymania]

hiya ross and d:
yes the lighting is pretty similar to what i have..
excepth for the distance .. i havent implemented that yet..
i havent had a good look at your code yet..

i am going to start a new thread and put up my requirements doc
for a redesign of the engine..
please add comments..

should be fun..
steve

[deamothul]

good idea steve