How to change the size of the texture resolution ?

[MartFayer]

How to change the size of the texture resolution?

 

I create texture .

Texture* Tex = Texture::Create(512, 512);
camera->SetRenderTarget(Tex);

 

 

draws its... OK...

context->DrawImage(Tex,0,0);

 

It is necessary to change the size of the texture .

 

 

Here it does not work:

 

camera->SetRenderTarget(0);
Tex->Release();
Texture* CamTex2 = Texture::Create(1024, 1024); //new size
Tex = CamTex2;
camera->SetRenderTarget(Tex);

 

 

After that - a black image :-/

 

How to decide ?

Thanks.

[MartFayer]

problem solved.

 

CamTex = Texture::Create(CamTexW, CamTexH);
camera->SetRenderTarget(CamTex);
CamTexMat->SetTexture(CamTex);

[Genebris]

OK, it turned out that there are two problems with this:

 

1. There has to be a model on a scene with a material that uses your target texture otherwise it won't update and only the first frame will be rendered in it.

 

2. If you have only one camera, texture anyway stops updating after resize. You need to have a second camera that renders on screen normally, then it will work.

 

My code:

function Script:Start ()

self.tex = Texture:Create(512,512)

 

self.cam=tolua.cast(self.entity, "Camera")

self.cam:SetRenderTarget(self.tex)

 

self.mat=Material:Create()

self.mat:SetTexture(self.tex)

self.mat:SetShader("Shaders/Model/Diffuse.shader")

self.mdl = Model:Create()

self.mdl:AddSurface()

self.mdl:SetMaterial(self.mat)

 

end

 

function Script:UpdateWorld()

if Window:GetCurrent():KeyHit(Key.A) then

self.tex = Texture:Create(256,256)

self.cam:SetRenderTarget(self.tex)

self.mat:SetTexture(self.tex)

end

end

 

function Script:PostRender()

Context:GetCurrent():DrawImage(self.tex,0,0)

end

 

This is a script on first camera and there is a second camera that renders normally. This way everything works as expected. But if I delete the second camera, target texture stops updating and image on the screen freezes.

 

Any idea what's wrong?