Modified normal mapping. looks awesome.

Community Forums/Graphic Chat/Modified normal mapping. looks awesome.

Ross C

(Posted 2006) [#1]

Hey, i have made some very small changes to this guys code:

http://www.blitzbasic.com/Community/posts.php?topic=39353

Basically, slapped on a new normal map and texture. This technique is brilliant! I've put a slightly larger cubemap texture too.

Arrow keys to move the camera around the rotating dragon and rotating landscape. A big hand to MSW! A and Z to zoom in and out.

http://www.rosscrooks.pwp.blueyonder.co.uk/normalmapping1.zip

And the Imp version:

http://www.rosscrooks.pwp.blueyonder.co.uk/imp.zip

Alienforce

(Posted 2006) [#2]

Cool!!! Thanks for sharing the code

Ross C

(Posted 2006) [#3]

Basically, as described in MSW's posts, you don't need to adjust any colours, as the cubemap handles all this. So just apply your normal map, light map, texture and cubemap, and your sorted.

Zmatrix

(Posted 2006) [#4]

yeah thats the same as the cubemap I use...it updates the normals correctly.

Looks good Ross :)

Sam

Ross C

(Posted 2006) [#5]

I found this code a while back. I can't remember who posted it, but i hope they don't mind it being reposted. This will generate a cubemap for correct lighting. Saves the image as "cubemap6.bmp"

;------------------------------------------------------------
; creates cubemap textures and saves one too as a single image

Graphics3D 800,600
SetBuffer BackBuffer()

Global texture = CreateTexture(256,256,128)

MakeCubeFace(texture)

Function MakeCubeFace(tex)

image = CreateImage(256,256)
cubeimage = CreateImage(256*6, 256)

SetBuffer ImageBuffer(image)

; left
SetCubeFace tex,0 
	For y=0 To 255
		For z=0 To 255			 
			Color 255, y, 255-z
			Plot z,y
		Next
	Next
CopyRect 0,0,256,256,0,0,ImageBuffer(image),TextureBuffer(tex) 
CopyRect 0,0,256,256,0,0,ImageBuffer(image),ImageBuffer(cubeimage) 


;back
SetCubeFace tex,1 
	For x=0 To 255
		For y=0 To 255		
			Color 255-x, y, 0
			Plot x,y
		Next
	Next
CopyRect 0,0,256,256,0,0,ImageBuffer(image),TextureBuffer(tex) 
CopyRect 0,0,256,256,256,0,ImageBuffer(image),ImageBuffer(cubeimage) 


; right
SetCubeFace tex,2
	For y=0 To 255
		For z=0 To 255
			Color 0, y, z
			Plot z,y
		Next
	Next
CopyRect 0,0,256,256,0,0,ImageBuffer(image),TextureBuffer(tex) 
CopyRect 0,0,256,256,512,0,ImageBuffer(image),ImageBuffer(cubeimage) 


;front
SetCubeFace tex,3
	For y=0 To 255
		For x=0 To 255
			Color x, y, 255
			Plot x,y
		Next
	Next
;EndIf
CopyRect 0,0,256,256,0,0,ImageBuffer(image),TextureBuffer(tex) 
CopyRect 0,0,256,256,256*3,0,ImageBuffer(image),ImageBuffer(cubeimage) 




; top
SetCubeFace tex,4
	For z=0 To 255
		For x=0 To 255
			Color 255-x, 0, 255-z
			Plot x,z
		Next
	Next
CopyRect 0,0,256,256,0,0,ImageBuffer(image),TextureBuffer(tex) 
CopyRect 0,0,256,256,256*4,0,ImageBuffer(image),ImageBuffer(cubeimage) 


;bottom
SetCubeFace tex,5
	For z=0 To 255
		For x=0 To 255
			Color 255-x, 255, z
			Plot x,z
		Next
	Next
CopyRect 0,0,256,256,0,0,ImageBuffer(image),TextureBuffer(tex) 
CopyRect 0,0,256,256,256*5,0,ImageBuffer(image),ImageBuffer(cubeimage) 

SaveImage (cubeimage,"cubemap6.bmp") 

FreeImage(image)
FreeImage(cubeimage)


SetBuffer BackBuffer() 

End Function

Zmatrix

(Posted 2006) [#6]

wow I missed that one, took me forvever to track down a normalizing cubemap..heh
I got the one I have from the Shader site.

thanks for the repost :)
Sam

Ross C

(Posted 2006) [#7]

Np's. Here's the imp you sent, using that code...
http://www.rosscrooks.pwp.blueyonder.co.uk/imp.zip

Braincell

(Posted 2006) [#8]

What would be nice tho is to have a moving light work with tangent space normal map (like the one in the imp.zip you sent). I havent looked into this at all, but do you think its possible to have the light rotate? Perhaps by animating the cubemap?

Ross C

(Posted 2006) [#9]

I think animating the cubemap would be feasable yeah. Probably be best off with a smaller cubemap than the one i have just now. To shift the light though, you can simply use entity colour. It will only give directional light though, but hey, you could have every entity's colour, calculated from the lights source.

Ross C

(Posted 2006) [#10]

Or maybe i'm talking through my arse... hehe, oops!

Zmatrix

(Posted 2006) [#11]

I sent another email :)
added a few things, used blend mode 5 to make it stark...like D3, (I preffer the orginal myself tho)
tried my hand at some specular masks .

you can control the brightness with q(brighter) and w(darker) keys.

also theres a differnt lcube with it...really a greyscale version of the normals cube..but you can change its color to have colored lights. and it looks a bit sharper and brighter.

I had some luck with generating the Cube in realtime using the Dot3light code from the forums.

Only lighting a Cube then flipping it and rendering the cubemap. it worked...but you would need a cubemap rendered for each entity , except for directional lights.

Sam

Ross C

(Posted 2006) [#12]

I got your email man, but the code doesn't seem to do anything over here... Just a full bright Imp and a fullbright landscape... tis odd. :o)

Zmatrix

(Posted 2006) [#13]

That is kinda Odd, it should start with no light at all..heh
the only thing I changed was the blendmodes.
You might try leaving them default instead of blend mode 5 on the Duffuse textures.

wait , gf4 might only have 4 texture stages per pass. I used 5 ...try taking the Spec mask out :)

Sam

Ross C

(Posted 2006) [#14]

Ok man :o) I will do. I had a similar problem a while back, with more than 4 textures.