Oolite Bulletins

Scarecrow wrote:

Okay, let's start at the beginning.

I'm looking at Griff's rocket example. The first section in the Fragment file is this:

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// Information from Oolite.
uniform sampler2D      tex0; // Difuse map
uniform sampler2D      tex1; // Glow map (always on)
uniform sampler2D      tex2; // effects map

It appears to be assigning the various textures to variable slots, but I couldn't figure out how. How does it know, for example that tex0 is the Diffuse map? I noticed that the line at the top says, 'information from oolite' so I guessed that maybe the textures are set up in the ship's config file.

I jumped over to the Rocket's Plist and sure enough, there's a shader setup:

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	<key>shaders</key>
		<dict>
			<key>griff_rocket_unshaded_diffuse.png</key>
			<dict>
				<key>textures</key>
					<array>
					<string>griff_rocket_shaded_diffuse.png</string>
					<string>griff_rocket_permaglowmap.png</string>
					<string>griff_rocket_effects.png</string>
					</array>
				<key>vertex_shader</key>
				<string>ahruman-generic.vertex</string>
				<key>fragment_shader</key>
				<string>griff_rocket.fragment</string>
			</dict>
		</dict>	
	</dict>

It does appear to be listing the three textures used in the shader and in the order that they are listed in the Fragment file. I assume that this is true: That if the diffuse texture is listed first then it will automatically become tex0 in the Fragment file?

The other big stumbling block is that this code is in HTML and I've no idea what this code should look like in script which is what the rest of my Plist is written in.

Comments? Answers? yes? no?

Crow

Scarecrow wrote:

Okay, so it appears that I need to set up shaders for each and every sub object too.
As I'll be using the same textures for all parts of the ship, is it possible to set the shader up just once in the Shipdata.Plist file and if so, where would I put it?

Griff wrote:

Have a look at this page too: http://wiki.alioth.net/index.php/Materials_in_Oolite you can use materials to provide texture for Oolites built in shaders, then you don't have to worry about creating vertex & fragment shaders, your ship will use the built in oolite ones.
I'm not sure which oxp's use materials so i can't link you to any examples at the moment, hopefully somebody will pass by with some links

Scarecrow wrote:

I'm used to Material editors in 3D programs that give me slots. All I need to do is tell it which diffuse texture to use, which normal map texture to use, which specular texture (or value) to use. Sadly, it doesn't seem that simple in Oolite
....
Finally, Uniforms appear to be entirely optional, will default if not specified here and not something I need to worry about right now.

Eric Walch wrote:

See for instance the latest asteroids.oxp were specular and normal maps are only added by the material directory.

Scarecrow wrote:

Cool. Can you link me, a search threw up nothing obvious.

Scarecrow wrote:

It does appear to be listing the three textures used in the shader and in the order that they are listed in the Fragment file. I assume that this is true: That if the diffuse texture is listed first then it will automatically become tex0 in the Fragment file?

uniforms =
{
    uDiffuseMap = { type = texture; value = 0; };
    uPermaGlowMap = { type = texture; value = 1; };
    uRocketEffectsMap = { type = texture; value = 2; };
};

Scarecrow wrote:

Also, what's this line for:

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<key>griff_rocket_unshaded_diffuse.png</key>

materials =
{
    "griff_rocket_unshaded_diffuse.png" =
    {
        diffuse_map = "griff_rocket_unshaded_diffuse.png";
    };
};

Scarecrow wrote:

Also, is 'Like_Ship' an actual command or are you just using a stand-in?

	"wreckage-component" =
	{
		ai_type = "nullAI.plist";
		cargo_type = "CARGO_NOT_CARGO";
		energy_recharge_rate = 0;
		forward_weapon_type = "WEAPON_NONE";
		fragment_chance = 0.2;
		max_energy = 2000;
		max_flight_pitch = 2;
		max_flight_roll = 2;
		max_flight_speed = 500;
		model = "wreck1.dat";
		name = "Wreckage";
		roles = "wreckage oolite-wreckage-component";
		scanClass = "CLASS_CARGO";
		thrust = 0;
	};
	"more-wreckage2" =
	{
		like_ship = "wreckage-component";
		model = "wreck2.dat";
		roles = "wreckage oolite-more-wreckage2";
	};