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The parameter A stands for alpha, which is the transparency channel. An alpha value of zero represents full transparency and a value of 1.0 represents a fully opaque pixel. The RGB values are not affe …

the mortar size is a percentage of the width or height so they won't be equal unless width = height or you can try this : tweak the scale on the Y axis till you get the effect

Shading Point is the nearest point of intersection of the camera ray with a visible object, which the render engine is currently calculating the color for (these calculations are referred to as shadi …

You can store the face ID as a vertex color o each face then read the vertex color using the Attribute node. This script will create a vertex color layer and store the face index as color : import bp …

you are using incorrect key , the key is the name of the movie clip #load new movie clip bpy.data.movieclips.load(clip_path) #get the new movie clip movie_clip = bpy.data.movieclips.get(clip_name) # …

By looking at the source code and the note saying : /* Vector combine / separate, used for the RGB and XYZ nodes */ They are the same, and they don't use one node probably just to avoid confusi …

I have experimented with it and this is what i come up with : The active_output is not a node type so it will not contain the active output node, it is NodeSocketInterface ( i don't know what this i …

The my_node.inputs[0] is a node Socket type, and the my_node.inputs[0].links is a read only list of links from this socket, so your first attempt won't work, and you have found the correct way, which …

The background is emitting light (by default). You can see the setting of the world background in the world Tab:

You can use the Set Alpha node found in : Add➝Converter➝Set Alpha use the mask node output as an Alpha input for the Set Alpha node :

I think you are using cycles and trying to use the texture node editor which you can't do cause there is no way to use those texture in cycles ,so to use this node editor you should be using blender r …

probably this material has been created for the blender render engine (by default nodes are disabled ) so you just have to enable using nodes before accessing the node tree by the following line : mat …

here is a quick solution : use this node setup set the pass index of the star to its emission brightness and here is the result :

Two independent node groups for creating a mask based on a color and a texture : material setup : the first node group outputs boolean 1/0 ( all comparisions are "less than "): the second node …

what i did is that i control the radius of the circle along the X axis to create the capsule the node group setup : the last input of the node group is the ratio of X/Y at the moment there is n …