Wave effect using shader

@Tankerpat wrote:

Hi,

Sorry in advance for my bad english level

I am trying to make a wave effect with shader.

It works fine only with a full screen quad renderer (position == cameraPosition)

I want to make this effect with a smaller quad without resize a final renderer target. (position != cameraposition)

Actually, I have a rendertarget 2D for my tile mapping layer and a second rendertarget 2D for my render light.

I combine the two rendertarget in a shader (colorMap + lightMap).

image1.png1293x757 675 KB

With this method :

            FinalRender.CurrentTechnique = FinalRender.Techniques["Light_Color_Wave"];           
            FinalRender.Parameters["ColorMap"].SetValue(rendertarget_Layer);
            FinalRender.Parameters["LightMap"].SetValue(rendertarget_Light);
            FinalRender.Parameters["WorldViewProjection"].SetValue(camera3D.WorldViewProjection);
            FinalRender.Parameters["Timer"].SetValue(totalTime);
            FinalRender.CurrentTechnique.Passes[0].Apply();

           QuadRenderer quadFullScreen = new QuadRenderer(game.GraphicsDevice);
           quadFullScreen.RenderQuad(game.GraphicsDevice, Vector2.One *-1, Vector2.One);

Now I want to pass with a other shader (waveFX) :

    game.GraphicsDevice.SetRenderTarget(rendertarget_Layer_2);         
    game.GraphicsDevice.Clear(Color.TransparentBlack);

    FinalRender.CurrentTechnique = FinalRender.Techniques["Light_Color"];           
    FinalRender.Parameters["ColorMap"].SetValue(rendertarget_Layer);
    FinalRender.Parameters["LightMap"].SetValue(rendertarget_Light);
    FinalRender.Parameters["WorldViewProjection"].SetValue(camera3D.WorldViewProjection);

    FinalRender.CurrentTechnique.Passes[0].Apply();

    QuadRenderer quadFullScreen = new QuadRenderer(game.GraphicsDevice);
    quadFullScreen.RenderQuad(game.GraphicsDevice, Vector2.One *-1, Vector2.One);               

    game.GraphicsDevice.SetRenderTarget(null);
    game.GraphicsDevice.Clear(Color.Transparent);

// WAVE EFFECT PASS

            waveFX.CurrentTechnique = waveFX.Techniques["Wave"];
            waveFX.Parameters["WorldViewProjection"].SetValue(camera3D.WorldViewProjection);
            waveFX.Parameters["Timer"].SetValue(totalTime);
            waveFX.Parameters["ColorMap"].SetValue(rendertarget_Layer_2);
            waveFX.CurrentTechnique.Passes[0].Apply();

            QuadRender quadRenderTest = 
            new QuadRender(new Vector3(0, 0, camera3D.Position.Z), Vector3.Forward, Vector3.Up);

            Vector2 v1 = new Vector2(0, 2120);
            Vector2 v2 = new Vector2(920, 3200);

            quadRenderTest.RenderQuad(game.GraphicsDevice, v1, v2);

image2.png1294x758 314 KB

Now my texture is resized

I think I need to calculate a texture position, but a better way may exist? Is it possible to make this inside a shader?

Thx in advance

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