Added 2d arc node (also useful to create torus arcs)

addons/material_maker/nodes/sdarc.mmg

@@ -0,0 +1,70 @@
+{
+	"name": "sdarc",
+	"node_position": {
+		"x": 0,
+		"y": 0
+	},
+	"parameters": {
+		"a1": 0,
+		"a2": 0,
+		"cx": 0,
+		"cy": 0,
+		"r": 0.4,
+		"r1": 0.3,
+		"r2": 0.1
+	},
+	"shader_model": {
+		"code": "",
+		"global": "float sdArc(vec2 p, vec2 sca, vec2 scb, float ra, float rb) {\n    p *= mat2(vec2(sca.x,sca.y),vec2(-sca.y,sca.x));\n    p.x = abs(p.x);\n    float k = (scb.y*p.x>scb.x*p.y) ? dot(p.xy,scb) : length(p.xy);\n    return sqrt( dot(p,p) + ra*ra - 2.0*ra*k ) - rb;\n}",
+		"inputs": [
+
+		],
+		"instance": "",
+		"name": "sdArc",
+		"outputs": [
+			{
+				"sdf2d": "sdArc($uv-vec2(0.5), vec2(cos($a1*0.01745329251), sin($a1*0.01745329251)),  vec2(cos($a2*0.01745329251), sin($a2*0.01745329251)), $r1, $r2)",
+				"type": "sdf2d"
+			}
+		],
+		"parameters": [
+			{
+				"default": 0,
+				"label": "Angle 1",
+				"max": 180,
+				"min": -180,
+				"name": "a1",
+				"step": 1,
+				"type": "float"
+			},
+			{
+				"default": 0,
+				"label": "Angle 2",
+				"max": 180,
+				"min": -180,
+				"name": "a2",
+				"step": 1,
+				"type": "float"
+			},
+			{
+				"default": 0.5,
+				"label": "Radius 1",
+				"max": 1,
+				"min": 0,
+				"name": "r1",
+				"step": 0.01,
+				"type": "float"
+			},
+			{
+				"default": 0.1,
+				"label": "Radius 2",
+				"max": 1,
+				"min": 0,
+				"name": "r2",
+				"step": 0.01,
+				"type": "float"
+			}
+		]
+	},
+	"type": "shader"
+}