You can calculate the radius of the light from the b parameter in the attenuation function (since the quadratic term dominates at large distances). However, the radius of 9 is too short - with your settings in the attenuation function, the light doesn't get close to zero until dist is around 100. For practical purposes in realtime CG we generally need to cut lights off at a finite distance, as you're doing with the if (dist < 9) clause. However, one disadvantage of it is that the light never quite goes to zero at any finite distance. In fact, with a = 0 it's a pretty good model of a spherical area light. This curve is nice because it approaches the physically-correct inverse square law at large distances, but it doesn't shoot up to infinity at short distances. To understand how this curve works it's helpful to play with the parameters interactively. Is a fairly common one in computer graphics - or, more generally, 1.0 / (1.0 + a*dist + b*dist*dist)) for some tweakable parameters a and b. The attenuation function you've got, att = 1.0 / (1.0 + 0.1*dist + 0.01*dist*dist) Vec3 final_color = ((0.1+torch_output) * textureColor) Vec3 torch_output = lightAdd * torchColor Vec3 textureColor = texture2D(texture, texture_coordinate).rgb
Vec3 surf2light = normalize(pos - vertex_pos) įloat dcont=max(0.0,dot(norm,surf2light)) I got the float att from a website, and it kinds works, but far from perfect.: void main()
#Light intensity formula code
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