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end if;
end loop;
-- * Face invariant : Normal of unrotated face
N := (0.0, 0.0, 0.0);
case fi.last_edge is
when 3 =>
Add_Normal_of_3p (o,
fi.P_compact (1),
fi.P_compact (2),
fi.P_compact (3),
N
);
when 4 =>
Add_Normal_of_3p (o, fa.P (1), fa.P (2), fa.P (4), N);
-- We sum other normals for not perfectly flat faces,
-- in order to have a convenient average .. .
Add_Normal_of_3p (o, fa.P (2), fa.P (3), fa.P (1), N);
Add_Normal_of_3p (o, fa.P (3), fa.P (4), fa.P (2), N);
Add_Normal_of_3p (o, fa.P (4), fa.P (1), fa.P (3), N);
end case;
length_N := Norm (N);
if Almost_zero (length_N) then
if strict_geometry then
pragma Warnings (Off, "this code can never be executed and has been deleted");
raise zero_summed_normal;
pragma Warnings (On, "this code can never be executed and has been deleted");
else
fi.normal := N; -- 0 vector !
end if;
else
fi.normal := (1.0 / length_N) * N;
end if;
end Calculate_face_invariants;
adjacent_faces : array (o.Point'Range) of Natural := (others => 0);
pf : Natural;
length : Real;
begin -- Pre_calculate
if full_check_objects then
pragma Warnings (Off, "this code can never be executed and has been deleted");
Check_object (o);
pragma Warnings (On, "this code can never be executed and has been deleted");
end if;
for i in o.face'Range loop
begin
-- Geometry
Calculate_face_invariants (o.face (i), o.Face_Invariant (i));
-- Disable blending when alphas are = 1
case o.face (i).skin is
when material_only | material_texture =>
o.Face_Invariant (i).blending := Is_to_blend (o.face (i).material);
when colour_only | coloured_texture | texture_only =>
o.Face_Invariant (i).blending := Is_to_blend (o.face (i).alpha);
when invisible =>
o.Face_Invariant (i).blending := False;
end case;
o.transparent := o.transparent or else o.Face_Invariant (i).blending;
exception
when zero_summed_normal =>
Raise_Exception (zero_summed_normal'Identity,
o.ID & " face =" & Integer'Image (i));
Function Definition: procedure Display_one (o : in out Object_3D) is
Function Body: -- Display only this object and not connected objects
-- out : object will be initialized if not yet
--
--
-- Display face routine which is optimized to produce a shorter list
-- of GL commands. Runs slower then the original Display face routine
-- yet needs to be executed only once.
--
-- Uwe R. Zimmer, July 2011
--
package Display_face_optimized is
procedure Display_face (First_Face : Boolean; fa : Face_type; fi : in out Face_invariant_type);
private
Previous_face : Face_type;
Previous_face_Invariant : Face_invariant_type;
end Display_face_optimized;
package body Display_face_optimized is
use GL.Materials;
procedure Display_face (First_Face : Boolean; fa : Face_type; fi : in out Face_invariant_type) is
blending_hint : Boolean;
begin -- Display_face
if fa.skin = invisible then
Previous_face := fa;
Previous_face_Invariant := fi;
return;
end if;