// This does once-per-light work, as well as once-per-material-per-light work.
// So this ends up being called multiple times with the same parameters, except
// for matObjName.
// matObjName is the name of the material being exported
// lightObjectName is the name of the light
public void ExportLight(LightPayload payload, IExportableMaterial exportableMaterial)
{
ObjectName lightNodeName = new ObjectName(payload.legacyUniqueName); // does need to be unique
// Add the light to the scene -- this does _not_ need to be done per-material.
// As a result, the node will generally have already been created.
GlTF_Node node = GlTF_Node.GetOrCreate(G, lightNodeName, payload.xform, null, out _);
node.lightNameThatDoesNothing = payload.name;
// The names of the uniforms can be anything, really. Named after the light is the most
// logical choice, but note that nobody checks that two lights don't have the same name.
// Thankfully for Tilt Brush, they don't.
// This should probably have used a guaranteed-unique name from the start but I don't want
// to change it now because it'd break my diffs and be kind of ugly.
string lightUniformPrefix = payload.name;
AddUniform(exportableMaterial, lightUniformPrefix + "_matrix",
GlTF_Technique.Type.FLOAT_MAT4, GlTF_Technique.Semantic.MODELVIEW, node);
// Add light color.
GlTF_Material mtl = G.materials[exportableMaterial];
var val = new GlTF_Material.ColorKV {
key = lightUniformPrefix + "_color",
color = payload.lightColor
};
mtl.values.Add(val);
AddUniform(exportableMaterial, val.key,
GlTF_Technique.Type.FLOAT_VEC4, GlTF_Technique.Semantic.UNKNOWN, node);
}
// Should be called per material.
public void ExportAmbientLight(IExportableMaterial exportableMaterial, Color color)
{
GlTF_Material mtl = G.materials[exportableMaterial];
var val = new GlTF_Material.ColorKV {
key = "ambient_light_color",
color = color
};
mtl.values.Add(val);
AddUniform(exportableMaterial, val.key,
GlTF_Technique.Type.FLOAT_VEC4, GlTF_Technique.Semantic.UNKNOWN);
}
// Export a single shader color uniform
public void ExportShaderUniform(
IExportableMaterial exportableMaterial, string name, Color value)
{
GlTF_Material mtl = G.materials[exportableMaterial];
var color_val = new GlTF_Material.ColorKV {
key = name, color = value
};
mtl.values.Add(color_val);
AddUniform(exportableMaterial, color_val.key,
GlTF_Technique.Type.FLOAT_VEC4, GlTF_Technique.Semantic.UNKNOWN);
}
