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Unlit


Setup

In industry-established terms, a material that is not affected by lighting is called “unlit” or “non-lit”. It is used to create retro-style graphics or for effects that should not depend on lighting (headlights, lamps).

This example contains a game object with a model that has an unlit material applied to it. The material is assigned custom vertex and fragment shaders. The shader is very simple and just transfers the texture color to the model. This is an excellent starting point for creating new materials and for creating effects that do not depend on lighting. The shaders are written in GLSL 1.40, which is available from Defold 1.9.2.

To activate a perspective camera and to have camera controls, we added the orbit_camera.script script from the Orbit Camera (3D) example.

The model used in this example is from Kenney’s Train Pack, licensed under CC0.

Scripts

unlit.vp

#version 140

// The model's vertex position and texture coordinates.
in vec4 position;
in vec2 texcoord0;

// The projection, view and world matrices.
uniform general_vp
{
    mat4 mtx_world;
    mat4 mtx_view;
    mat4 mtx_proj;
};

// The output of a vertex shader are passed to the fragment shader.
// The texture coordinates of the vertex.
out vec2 var_texcoord0;

void main()
{
    // Pass the texture coordinates to the fragment shader.
    var_texcoord0 = texcoord0;

    // Transform the vertex position to clip space.
    gl_Position = mtx_proj * mtx_view * mtx_world * vec4(position.xyz, 1.0);
}

unlit.fp

#version 140

// Inputs should match the vertex shader's outputs.
in vec2 var_texcoord0;

// The texture to sample.
uniform lowp sampler2D texture0;

// The final color of the fragment.
out lowp vec4 final_color;

void main()
{
    // Sample the texture at the fragment's texture coordinates.
    vec4 color = texture(texture0, var_texcoord0.xy);

    // Output the sampled color.
    final_color = color;
}

If you want to play with these examples, you can get the project on Github.

Do you want to see more examples? Why not write a few yourself and submit a pull request? We love contributions.

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