fix links

threejs/lessons/threejs-backgrounds.md

@@ -4,7 +4,7 @@ Description: How to add a background in THREE.js
 Most of the articles here use a solid color for a background.
 
 Adding as static background can be as simple as setting some CSS. Taking
-an example from [the article on making THREE.js responsive](../threejs-responsive.html)
+an example from [the article on making THREE.js responsive](threejs-responsive.html)
 we only need to change 2 things.
 
 We need to add some CSS to our canvas to set its background to an image
@@ -105,7 +105,7 @@ it, draw it from the inside. On each side of the cube put a texture (using
 texture coordinates) that looks like some image of the horizon. It's also often
 common to use a sky sphere or a sky dome with a texture drawn on it. You can
 probably figure that one out on your own. Just make a cube or sphere, 
-[apply a texture](../threejs-textures.html), mark it as `THREE.BackSide` so we 
+[apply a texture](threejs-textures.html), mark it as `THREE.BackSide` so we 
 render the inside instead of the outside, and either put it in your scene directly 
 or like above, or, make 2 scenes, a special one to draw the skybox/sphere/dome and the
 normal one to draw everything else. You'd use your normal `PerspectiveCamera` to

threejs/lessons/threejs-shadertoy.md

@@ -239,7 +239,7 @@ void mainImage( out vec4 fragColor, in vec2 fragCoord )
 }
 ```
 
-Passing a texture into a shader is similar to [passing one into a normal material](../threejs-textures.html) but we need to set up the texture on the uniforms.
+Passing a texture into a shader is similar to [passing one into a normal material](threejs-textures.html) but we need to set up the texture on the uniforms.
 
 First we'll add the uniform for the texture to the shader. They're referred to as `sampler2D` in GLSL.
 
@@ -254,7 +254,7 @@ uniform float iTime;
 ...
 ```
 
-Then we can load a texture like we covered [here](../threejs-textures.html) and assign the uniform's value.
+Then we can load a texture like we covered [here](threejs-textures.html) and assign the uniform's value.
 
 ```js
 +const loader = new THREE.TextureLoader();
@@ -330,7 +330,7 @@ and we no longer need to set it at render time
 uniforms.iTime.value = time;
 ```
 
-Otherwise I copied back in the original camera and code that sets up 3 rotating cubes from [the article on responsiveness](../threejs-responsive.html). The result:
+Otherwise I copied back in the original camera and code that sets up 3 rotating cubes from [the article on responsiveness](threejs-responsive.html). The result:
 
 {{{example url="../threejs-shadertoy-as-texture.html" }}}