Normal mapping

Blitz3D Forums/Blitz3D Programming/Normal mapping

gotelin (Posted 2004) [#1]

Is possible use normal mapping and color texture in a model with Blitz3D? I see normal demo, but use normal mapping without another texture (color) and ambient light is very short, is possible use with good light and 2 textures? Thanks, Is there a example?

jfk EO-11110 (Posted 2004) [#2]

It is possible, at least kind of. Fredborg released a demo sometime ago, use the search tools.

jfk EO-11110 (Posted 2004) [#3]

Ah, it's in his sig: http://home1.stofanet.dk/mfredborg/DotMyBot.zip BTW the head mesh in the demo sometimes makes problems on some systems, in that case simply import it somewhere and then export it again to make it work.

N (Posted 2004) [#4]

Pseudo-tutorial-in-a-codebox ;; STEP 1 :: Load normal map NM = LoadTexture("normalmap.png") ;; STEP 2 :: Make it combine with the previous texture through a dot product TextureBlend NM,4 ;; STEP 3 :: Apply it to an entity EntityTexture Entity,NM,0,0 ;; STEP 4 :: Inside the main loop, update the entity's lighting either through vertex coloring or the EntityColor instruction. EntityColor is faster but will be inaccurate, while VertexColor is slower but going to provide a lot more accuracy in the normal map. Here I'll use EntityColor EntityColor Entity, 127 -0, 127 +64, 127 +127 ;; The light is in front of and above the entity in this case (at least if I'm not mistaken, I'm a bit clueless right now so bear with me) Only did this once on my own, so whatever.

Paolo (Posted 2004) [#5]

You can download a normal mapping example with textures from my sig. The code is short but not fully useful without modifications to meet your project settings, but may be you can use it as a reference. Paolo.

Rob (Posted 2004) [#6]

And in my sig :)