Blockland Forums > General Discussion
Who chose to use per-pixel lighting?
otto-san:
chrisbot is right
Acerblock:
You're right Chris, in fact kompressor is credited for the Oct-Tree in the F1 menu. I didn't know what it was until now, it makes sense. It's actually pretty interesting.
Port:
--- Quote from: Altiris on May 25, 2013, 09:14:43 AM ---With Voxel lighting you don't have that annoying 8 light limit
--- End quote ---
Er, no, the lighting method has nothing to do with light limits.
The reason we have a limit of 8 lights is because the point lighting uses a manually unrolled loop.
--- Code: ---// Point lighting
uniform vec4 pointLightPos0;
uniform vec4 pointLightColor0;
uniform float pointLightRadius0;
uniform vec4 pointLightPos1;
uniform vec4 pointLightColor1;
uniform float pointLightRadius1;
uniform vec4 pointLightPos2;
uniform vec4 pointLightColor2;
uniform float pointLightRadius2;
uniform vec4 pointLightPos3;
uniform vec4 pointLightColor3;
uniform float pointLightRadius3;
uniform vec4 pointLightPos4;
uniform vec4 pointLightColor4;
uniform float pointLightRadius4;
uniform vec4 pointLightPos5;
uniform vec4 pointLightColor5;
uniform float pointLightRadius5;
uniform vec4 pointLightPos6;
uniform vec4 pointLightColor6;
uniform float pointLightRadius6;
uniform vec4 pointLightPos7;
uniform vec4 pointLightColor7;
uniform float pointLightRadius7;
vec4 accumulatePointLights()
{
vec4 pointLightTotal = vec4(0.0f, 0.0f, 0.0f, 0.0f);
vec3 lightDelta = vec3(0.0f, 0.0f, 0.0f);
float lightDot = 0.0f;
float ratio = 0.0f;
// Calculate effects of the 8 point lights.
lightDelta = worldPos.xyz - pointLightPos0.xyz;
lightDot = max(dot(-normalize(lightDelta), worldNormal), 0.0f);
ratio = 1.0f - (length(lightDelta) / pointLightRadius0);
ratio = ratio * ratio * ratio * 0.4f;
ratio = max(ratio, 0.0f);
pointLightTotal.xyz += ratio * lightDot * pointLightColor0.xyz;
lightDelta = worldPos.xyz - pointLightPos1.xyz;
lightDot = max(dot(-normalize(lightDelta), worldNormal), 0.0f);
ratio = 1.0f - (length(lightDelta) / pointLightRadius1);
ratio = ratio * ratio * ratio * 0.4f;
ratio = max(ratio, 0.0f);
pointLightTotal.xyz += ratio * lightDot * pointLightColor1.xyz;
lightDelta = worldPos.xyz - pointLightPos2.xyz;
lightDot = max(dot(-normalize(lightDelta), worldNormal), 0.0f);
ratio = 1.0f - (length(lightDelta) / pointLightRadius2);
ratio = ratio * ratio * ratio * 0.4f;
ratio = max(ratio, 0.0f);
pointLightTotal.xyz += ratio * lightDot * pointLightColor2.xyz;
lightDelta = worldPos.xyz - pointLightPos3.xyz;
lightDot = max(dot(-normalize(lightDelta), worldNormal), 0.0f);
ratio = 1.0f - (length(lightDelta) / pointLightRadius3);
ratio = ratio * ratio * ratio * 0.4f;
ratio = max(ratio, 0.0f);
pointLightTotal.xyz += ratio * lightDot * pointLightColor3.xyz;
lightDelta = worldPos.xyz - pointLightPos4.xyz;
lightDot = max(dot(-normalize(lightDelta), worldNormal), 0.0f);
ratio = 1.0f - (length(lightDelta) / pointLightRadius4);
ratio = ratio * ratio * ratio * 0.4f;
ratio = max(ratio, 0.0f);
pointLightTotal.xyz += ratio * lightDot * pointLightColor4.xyz;
lightDelta = worldPos.xyz - pointLightPos5.xyz;
lightDot = max(dot(-normalize(lightDelta), worldNormal), 0.0f);
ratio = 1.0f - (length(lightDelta) / pointLightRadius5);
ratio = ratio * ratio * ratio * 0.4f;
ratio = max(ratio, 0.0f);
pointLightTotal.xyz += ratio * lightDot * pointLightColor5.xyz;
lightDelta = worldPos.xyz - pointLightPos6.xyz;
lightDot = max(dot(-normalize(lightDelta), worldNormal), 0.0f);
ratio = 1.0f - (length(lightDelta) / pointLightRadius6);
ratio = ratio * ratio * ratio * 0.4f;
ratio = max(ratio, 0.0f);
pointLightTotal.xyz += ratio * lightDot * pointLightColor6.xyz;
lightDelta = worldPos.xyz - pointLightPos7.xyz;
lightDot = max(dot(-normalize(lightDelta), worldNormal), 0.0f);
ratio = 1.0f - (length(lightDelta) / pointLightRadius7);
ratio = ratio * ratio * ratio * 0.4f;
ratio = max(ratio, 0.0f);
pointLightTotal.xyz += ratio * lightDot * pointLightColor7.xyz;
return pointLightTotal;
}
--- End code ---
Greek2me:
--- Quote from: Port on May 25, 2013, 01:28:09 PM ---Er, no, the lighting method has nothing to do with light limits.
The reason we have a limit of 8 lights is because the point lighting uses a manually unrolled loop.
--- End quote ---
Do you remember why he did that?
Brian Smithers:
--- Quote from: Greek2me on May 25, 2013, 01:37:11 PM ---Do you remember why he did that?
--- End quote ---
He was on a lot of meth when he did that.