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For example if I am painting a plane I only want its certain specified part to be painted. I tried using a box to cover the area which is not to be painted and when i start painting, the whole area gets painted. So I want to how paint only a certain specified area.

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  • $\begingroup$ Enable the ''Face selection masking for painting'' option. $\endgroup$ – Paul Gonet Oct 9 '15 at 11:03
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Masking using 'Face selection masking for painting' option.

enter image description here enter image description here Enable the Face selection masking for painting option. Press A to display the grid and select faces you want to paint using RMB.


Masking using painted stencil.

enter image description here

In Uv/Image Editor add a new image, change its name and set its color to white. enter image description here

Paint the areas where you want your texture to appear with a black color (create a mask). Save an image. Your mask is ready. enter image description here

In Slots bookmark of a Tool Shelf check the Mask checkbox, choose the UV map you want to use (the one with the painted stencil displayed). Then select your painted mask image (click on an image icon under the Stencil Image). If you want to inverse the mask click on the b&w square under the Visualisation.
enter image description here

Add a new material and a texture (an image) you want to paint on. Now when you paint in a Texture Paint mode your brush strokes'll apear only in a black areas of your mask. enter image description here

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    $\begingroup$ Your idea will work when I want to restrict certain faces which is not to be painted but how to restrict certain area within a face. $\endgroup$ – simon143 Oct 9 '15 at 14:43
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    $\begingroup$ Please see my updated answer. Hope this is what you're looking for :). $\endgroup$ – Paul Gonet Oct 9 '15 at 17:48

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