Add lever and jump pad components with activation logic

addons/rmsmartshape/documentation/Normals.md

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+# Normals
+
+## Default Normals
+
+Even if you assign normal textures to your Edge Material, the normals will look wrong.
+
+For example, consider the following image:
+
+![Normals Wrong](./imgs/NormalWrong.png)
+
+The normals in the image clearly don't line up with where the light is actually coming from.
+
+## Encoding Normal data in the canvas_item Vertex Shader Color Parameter
+
+As SmartShape renders the edges, the textures and their normal textures are also rotated.
+This will result in incorrect normals.
+To solve this, we can use a shader to correctly calculate the normals.
+
+The tricky part lies in how few ways there are to pass data to a canvasItem shader on a per-vertex basis.
+See here for the full list:
+https://docs.godotengine.org/en/stable/tutorials/shading/shading_reference/canvas_item_shader.html#doc-canvas-item-shader
+
+Fortunately, the COLOR parameter can be used for this purpose.
+The COLOR ENCODING paramter of an Edge Material can be used to choose what data is encoded in the
+Vertex Shader's Color Parameter.
+
+If we set the COLOR ENCODING value to "Normals", we get this:
+
+![Normals wrong with weird diffuse colors](./imgs/NormalColors.png)
+
+Ok, so now the normals still look wrong, but the colors look wrong too. Great.
+
+There is one final step before our normals will be correct. We need to decode the normal data in a shader.
+
+
+## Writing a Shader
+
+You'll want to assign a new shader to the Edge Material's material property.
+This shader will determine how each edge is rendered.
+
+Here's a sample shader to decode our normal data and set our actual color to that of our diffuse texture:
+
+```glsl
+shader_type canvas_item;
+
+varying mat2 NORMAL_MATRIX;
+
+void vertex() {
+	NORMAL_MATRIX = mat2(COLOR.rg, COLOR.ba)*2.0 - mat2(vec2(1.0), vec2(1.0));
+}
+
+void fragment() {
+	NORMAL.xy = NORMAL_MATRIX*NORMAL.xy;
+	COLOR = texture(TEXTURE, UV);
+}
+```
+
+After assigning this shader the the Edge Material's material property, our normals finally look right:
+
+![Normals Correct](./imgs/NormalCorrect.png)