[gd_resource type="CanvasItemMaterial" load_steps=3 format=1]

[ext_resource path="res://faceNormal.png" type="Texture" id=1]

[sub_resource type="CanvasItemShader" id=1]

_code = { "fragment":"// just pass the normal\n\nuniform texture normal;\nvec2 ywnormal=tex( normal,UV).wy * vec2(2.0,2.0) - vec2(1.0,1.0);\nNORMAL=vec3(ywnormal,sqrt(1 - (ywnormal.x * ywnormal.x) - (ywnormal.y * ywnormal.y) ));\n\n", "fragment_ofs":0, "light":"//the tile half size in pixels\nvec2 tile_vec=vec2(140,70);\nfloat z_scale = 1.0;\n//compute a 3D postion fot thelight\nvec3 light_3d = vec3(-LIGHT_VEC.x,LIGHT_HEIGHT,LIGHT_VEC.y);\n\n//rotate the normal map to the same coordinates as the pseudo 3d ponit\n//this could be optimized\nfloat r = asin(tile_vec.y/tile_vec.x);\nmat3 rot_mat = mat3( vec3(1,0,0), vec3(0,cos(r),-sin(r)), vec3(0,sin(r),cos(r)));\nvec3 n =  rot_mat * NORMAL;\nn.y=-n.y;\n\n//compute diffuse light\nfloat dp = max(dot(normalize(n),-normalize(light_3d)),0);\nLIGHT=vec4(vec3(dp),1.0)*COLOR*LIGHT_COLOR;\n", "light_ofs":0, "vertex":"//pass the x1 in local sprite coordinates.\n//the sprite center (small red cross) is 0,0\nVAR1.xy=SRC_VERTEX;", "vertex_ofs":0 }

[resource]

shader/shader = SubResource( 1 )
shader/shading_mode = 0
shader_param/normal = ExtResource( 1 )