Texture Scratching

[BarbosaRTS]

Hi,

I would like to realize an effect of scratching, with the touch scratch a texture to appear the other one.

I puts an image " scratch here " in first texture on a plane object and second image in the second texture.

You have an idea?

[EgonOlsen]

You could blend both textures together using decal mode (http://www.jpct.net/jpct-ae/doc/com/threed/jpct/TextureInfo.html#MODE_DECAL) and modify the "scratch here" texture's alpha when scratching by using an ITextureEffect implementation. However, this causes texture uploads to the gpu and these aren't very fast. It might be feasible though, if how don't need 60 fps in this case.

[BarbosaRTS]

Thank you.

I blend both textures, it's ok for apply effect with seteffect.
But now how make this effect to apply alpha reduction.

ITextureEffect :

init, apply, containsAlpha ...... 

[EgonOlsen]

Let containsAlpha() return true and set the new alpha in the destination int[] array. The format is ARGB, i.e. alpha is located in the upper 8 bits of the int.

[BarbosaRTS]

Finally I add two object3D, picture under, picture overground.

When getAction return MOVE i reduce transparency of Object .

Thank you.