In this tutorial, we will apply a label to a wine bottle.
The label has several points of interest which we’ll cover. In this tutorial we will define the dimensions of the label and will apply the texture correctly.
When opening the file and rendering the camera view, we should have an image like this one:
The bottle is a fairly large one: 4x4x15 inches. The label will be 6 inches high.
The first thing we need to do is calculate the image map size for our label. We’ll do a little math calculating the sheet of a cylinder. The sheet of a cylinder is
2πr in width and h in height, where r is the radius of the cylinder, in this case our bottle; and h is the height of the cylinder, in this case our label. π is a constant, around 3.14.
Our radius is 2 inches, and our height is 6 inches. The image will need to be. 2*3.14*2=12.6 inches in width and 6 inches in height. In pixels, a 1260 x 600 pixel image will do fine.
This label image map will completely wrap itself around the bottle, so we can do what we want with it. We can have a front and a back label, we can create a solid label that covers the whole bottle, it’s up to us.
Let us create a base texture that is properly placed in the bottle. From there, we’ll be able to modify the texture however we like.
This base texture has only a stencil map. The map is white, 1260*600 pixels.
The Label texture, for now. Click for a larger view
Make sure the Stencil channel is set to reveal Invisible instead of revealing White.
Make sure the stencil channel is revealing “invisible” instead of revealing white.
When we apply the texture to the bottle, it defaults to cylindrical mapping, like in the image below.
The default mapping. Note the INF values for x and y reps
Textures default to repeating themselves infinitely to cover the surface. Most of the time this is a desirable behavior, but now we are going to change it to allow just one repetition. We need just one label on the bottle.
Repetitions corrected to allow just one repetition of the texture.
The next step is scaling the texture so that it is the correct size. The default behavior is that the texture completely covers the object.
Click on the Position button, and scale and move the texture so that it is 6 inches high and is placed toward the part of the bottle where the walls are vertical.
The label in its proper place
The render should be something like the image below.
In the next tutorial we will define the shape of the label with a Stencil map.
These are the 4 tutorials:
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