Use castle for vecmath (doesn't work fully yet)

src/assets/Materials.zig

@@ -80,8 +80,8 @@ pub fn init(engine: *Engine, allocator: std.mem.Allocator) !Materials {
         .element_offset = Id.empty.toInt(),
         .elements = &.{
             .{
-                .base_color = .{ 0, 0, 0 },
-                .emissive = .{ 1, 0, 1 },
+                .base_color = .zero,
+                .emissive = .init(1, 0, 1),
                 .ior = 1.45,
                 .metallic = 0,
                 .normal_scale = 1,
@@ -295,8 +295,8 @@ fn loadMaterial(self: *Materials, engine: *Engine, textures: *Textures, filename
         .element_offset = index,
         .elements = &.{
             .{
-                .base_color = material_json.baseColor,
-                .emissive = material_json.emissive,
+                .base_color = .initArray(material_json.baseColor),
+                .emissive = .initArray(material_json.emissive),
                 .ior = material_json.ior,
                 .metallic = material_json.metallic,
                 .normal_scale = material_json.normalScale,