Materials are now working in both Psychopath and PsychoBlend.

Except that Emit is still not properly supported, because it needs
special handling.

psychoblend/assembly.py

@@ -12,6 +12,7 @@ class Assembly:
         self.objects = []
         self.instances = []
 
+        self.material_names = set()
         self.mesh_names = set()
         self.assembly_names = set()
 
@@ -119,10 +120,19 @@ class Assembly:
         if should_export_mesh:
             self.mesh_names.add(mesh_name)
             self.objects += [Mesh(self.render_engine, ob, mesh_name)]
+
+            # Get materials
+            for ms in ob.material_slots:
+                if ms != None:
+                    if ms.material.name not in self.material_names:
+                        self.material_names.add(ms.material.name)
+                        self.materials += [Material(self.render_engine, ms.material)]
+
             return mesh_name
         else:
             return None
 
+
     def get_sphere_lamp(self, ob, group_prefix):
         name = group_prefix + "__" + escape_name(ob.name)
         self.objects += [SphereLamp(self.render_engine, ob, name)]
@@ -281,5 +291,46 @@ class Instance:
         w.write("Data [$%s]\n" % self.data_name)
         for mat in self.time_xforms:
             w.write("Transform [%s]\n" % mat2str(mat.inverted()))
+        for ms in self.ob.material_slots:
+            if ms != None:
+                w.write("SurfaceShaderBind [$%s]\n" % escape_name(ms.material.name))
+                break
         w.unindent()
         w.write("}\n")
+
+
+class Material:
+    def __init__(self, render_engine, material):
+        self.mat = material
+
+    def take_sample(self, render_engine, time, translation_offset):
+        # TODO: motion blur of material settings
+        pass
+
+    def export(self, render_engine, w):
+        render_engine.update_stats("", "Psychopath: Exporting %s" % self.mat.name)
+
+        w.write("SurfaceShader $%s {\n" % escape_name(self.mat.name))
+        w.indent()
+        if self.mat.psychopath.surface_shader_type == 'Emit':
+            w.write("Type [Emit]\n")
+            color = self.mat.psychopath.color
+            w.write("Color [%f %f %f]\n" % (color[0], color[1], color[2]))
+        elif self.mat.psychopath.surface_shader_type == 'Lambert':
+            w.write("Type [Lambert]\n")
+            color = self.mat.psychopath.color
+            w.write("Color [%f %f %f]\n" % (color[0], color[1], color[2]))
+        elif self.mat.psychopath.surface_shader_type == 'GTR':
+            w.write("Type [GTR]\n")
+            color = self.mat.psychopath.color
+            w.write("Color [%f %f %f]\n" % (color[0], color[1], color[2]))
+            w.write("Roughness [%f]\n" % self.mat.psychopath.roughness)
+            w.write("TailShape [%f]\n" % self.mat.psychopath.tail_shape)
+            w.write("Fresnel [%f]\n" % self.mat.psychopath.fresnel)
+        else:
+            raise "Unsupported surface shader type '%s'" % self.mat.psychopath.surface_shader_type
+        w.unindent()
+        w.write("}\n")
+
+    def cleanup(self):
+        pass

src/parse/psy_surface_shader.rs

@@ -35,7 +35,30 @@ pub fn parse_surface_shader<'a>(
     };
 
     let shader = match type_name {
-        "Emit" => unimplemented!(),
+        "Emit" => {
+            let color = if let Some((_, contents, byte_offset)) =
+                tree.iter_leaf_children_with_type("Color").nth(0)
+            {
+                if let IResult::Done(_, color) =
+                    closure!(tuple!(ws_f32, ws_f32, ws_f32))(contents.as_bytes())
+                {
+                    // TODO: handle color space conversions properly.
+                    // Probably will need a special color type with its
+                    // own parser...?
+                    XYZ::from_tuple(rec709_e_to_xyz(color))
+                } else {
+                    // Found color, but its contents is not in the right format
+                    return Err(PsyParseError::UnknownError(byte_offset));
+                }
+            } else {
+                return Err(PsyParseError::MissingNode(
+                    tree.byte_offset(),
+                    "Expected a Color field in Emit SurfaceShader.",
+                ));
+            };
+
+            arena.alloc(SimpleSurfaceShader::Emit { color: color })
+        }
         "Lambert" => {
             let color = if let Some((_, contents, byte_offset)) =
                 tree.iter_leaf_children_with_type("Color").nth(0)
@@ -60,7 +83,84 @@ pub fn parse_surface_shader<'a>(
 
             arena.alloc(SimpleSurfaceShader::Lambert { color: color })
         }
-        "GTR" => unimplemented!(),
+        "GTR" => {
+            // Color
+            let color = if let Some((_, contents, byte_offset)) =
+                tree.iter_leaf_children_with_type("Color").nth(0)
+            {
+                if let IResult::Done(_, color) =
+                    closure!(tuple!(ws_f32, ws_f32, ws_f32))(contents.as_bytes())
+                {
+                    // TODO: handle color space conversions properly.
+                    // Probably will need a special color type with its
+                    // own parser...?
+                    XYZ::from_tuple(rec709_e_to_xyz(color))
+                } else {
+                    // Found color, but its contents is not in the right format
+                    return Err(PsyParseError::UnknownError(byte_offset));
+                }
+            } else {
+                return Err(PsyParseError::MissingNode(
+                    tree.byte_offset(),
+                    "Expected a Color field in GTR SurfaceShader.",
+                ));
+            };
+
+            // Roughness
+            let roughness = if let Some((_, contents, byte_offset)) =
+                tree.iter_leaf_children_with_type("Roughness").nth(0)
+            {
+                if let IResult::Done(_, roughness) = ws_f32(contents.as_bytes()) {
+                    roughness
+                } else {
+                    return Err(PsyParseError::UnknownError(byte_offset));
+                }
+            } else {
+                return Err(PsyParseError::MissingNode(
+                    tree.byte_offset(),
+                    "Expected a Roughness field in GTR SurfaceShader.",
+                ));
+            };
+
+            // TailShape
+            let tail_shape = if let Some((_, contents, byte_offset)) =
+                tree.iter_leaf_children_with_type("TailShape").nth(0)
+            {
+                if let IResult::Done(_, tail_shape) = ws_f32(contents.as_bytes()) {
+                    tail_shape
+                } else {
+                    return Err(PsyParseError::UnknownError(byte_offset));
+                }
+            } else {
+                return Err(PsyParseError::MissingNode(
+                    tree.byte_offset(),
+                    "Expected a TailShape field in GTR SurfaceShader.",
+                ));
+            };
+
+            // Fresnel
+            let fresnel = if let Some((_, contents, byte_offset)) =
+                tree.iter_leaf_children_with_type("Fresnel").nth(0)
+            {
+                if let IResult::Done(_, fresnel) = ws_f32(contents.as_bytes()) {
+                    fresnel
+                } else {
+                    return Err(PsyParseError::UnknownError(byte_offset));
+                }
+            } else {
+                return Err(PsyParseError::MissingNode(
+                    tree.byte_offset(),
+                    "Expected a Fresnel field in GTR SurfaceShader.",
+                ));
+            };
+
+            arena.alloc(SimpleSurfaceShader::GTR {
+                color: color,
+                roughness: roughness,
+                tail_shape: tail_shape,
+                fresnel: fresnel,
+            })
+        }
         _ => unimplemented!(),
     };
 

src/tracer.rs

@@ -7,7 +7,7 @@ use scene::{Assembly, Object, InstanceType};
 use surface::SurfaceIntersection;
 use transform_stack::TransformStack;
 use shading::{SurfaceShader, SimpleSurfaceShader};
-use color::XYZ;
+use color::{XYZ, rec709_to_xyz};
 
 
 pub struct Tracer<'a> {
@@ -185,8 +185,9 @@ impl<'a> TracerInner<'a> {
     ) {
         match *obj {
             Object::Surface(surface) => {
-                let unassigned_shader =
-                    SimpleSurfaceShader::Lambert { color: XYZ::new(1.0, 0.0, 1.0) };
+                let unassigned_shader = SimpleSurfaceShader::Lambert {
+                    color: XYZ::from_tuple(rec709_to_xyz((1.0, 0.0, 1.0))),
+                };
                 let shader = surface_shader.unwrap_or(&unassigned_shader);
 
                 surface.intersect_rays(