Oolite Bulletins

Simon B wrote:

Sanity check:

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Does this mean I no longer need seperate dat files for different skins? (i.e. I can use the same model with different illumination maps?)[/quote]
Apparently So... still unable to use openstep though.

To reskin an existing ship, just point the dict entry at a complete one, then use the shader entry to swap out the diffuse maps. You can reuse effects that way too.

Griff wrote:

what can also look cool is if you use the diffuse map to color the specular, unfortunately i couldn't find a colourful example so this ship with it's grey/green murky texture will have to do:

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// Calculate the basic ship colour & add in the specular effects 
   vec4 color = diffuse * diffuseMap + (specular * diffuseMap * 3.0) * specIntensity; 

here, just multiply the specular by the diffuseMap and in this case then multiply it by 3.0 to really make the effect more notcable.

to break down this line:
the 'diffuse' value is being calculated by the light macro and it's basically the amount of shadowing effect to be added to the colour value depending on how the poly fragment is pointing to or away from the lightsource.

the diffuseMap value is the colour of the relevant pixel from the texture map

the 'specular' value is being calculated by the light macro and it's basically the addition of the lightsource colour to the final colour depending on how the poly fragment is pointing to or away from the lightsource.

the light macro i keep talking about looks like this:

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// Calculate the contribution of a single light. Ought to be a function, but OS X's GLSlang implementation isn't sufficiently clever.
   #define LIGHT(idx) \
        { \
           vec3 lightVector   = normalize(gl_LightSource[idx].position.xyz); \
           vec3 reflection   = normalize(-reflect(lightVector, v_normal)); \
           diffuse += gl_FrontMaterial.diffuse * gl_LightSource[idx].diffuse * max(dot(v_normal, lightVector), 0.0); \
           specular += gl_LightSource[idx].diffuse * pow(max(dot(reflection, eyeVector), 0.0), specExponent); \
        }

Simon B wrote:

Has anyone worked out how big the advantage in distributing oxps as zip files actually is?