How can i make gradient fit in to a shape

[fallow cypress]

Hi i would like to strech my gradient left to right without stretching it top and bottom i need to make displacment map but i cant all of the settings of the gradient are ok but shape isn't and i don't know how can i fix it

[sick mango]

You can use a fill in the shape fill (I'm assuming your shape is a vector shape)

see the gradient icon in the middle of the fill box of the shapes?

This is how your shape will fill

Then you can check the properties panel to tweak your gradient there

adding stops, changing opacity and position settings, the angle, the scale, and obviously the colours

If your shape isn't a vector one, you will need to create a mask to constrait a standard gradient to this shpe, but I strongly recomment using vector shapes for this as they are neater and more precise but also easily tranformed, without loosing any quality.

[fallow cypress]

thanks it's almost perfect but can i crop it on the corners

i would like effect like this

i achived it with gaussian blur but it's much worse and gausian blur leaves weird streches and i cant accept this becouse it makes my redners look very bad

[sick mango]

You need to apply a mask on your vector shape, and possibly blur that mask if needed. You can also apply a gradient on the masks if you want a progressive blur...
If these are 3D renders, then the effect you want to make should be available to do directly in the 3D program I should think?