Texture break when drawing with Mesh

hnim

i want to implement skew function with Mesh Api. But when i add texture, it isnt smooth as i hope
this's my code:

local tx = Texture.new("gfx/image.png", true) local mesh = Mesh.new() mesh:setVertices(1, 10, 30, 2, 100, 10, 3, 100, 100, 4, 10, 80) mesh:setIndexArray(1, 2, 3, 1, 3, 4) mesh:setTexture(tx) mesh:setTextureCoordinates(1,0,0,2,119,0,3,119,118,4,0,119) stage:addChild(mesh)

atilim

If the subdivide the mesh (e.g. 16x16), you can mimic the skew effect correctly. Otherwise currently there is no other way.

hnim

thank you

Rickyngk

@atilim: I used to face with the similar issue when working with openGL 3D caused by glHint (GL_PERSPECTIVE_CORRECTION_HINT). I dunno if it is as same as this issue ?

Rickyngk

Another question (off topic )
afaik, iOS supports msaa well. Should we use it to improve line alias issue ?

techdojo

That takes me back - it's the same effect as original Playstation 1 when the textured poly's got too close to the screen, it's because the texturing takes place in 2D screen space not 3D space and doesn't allow for perspective correction.

As @Atilim said - you can subdivide the poly to help alleviate the problem but it'll never go away.

Maybe when we move over to OpenGL 2 a perspective correct shader could be used instead.

atilim

@Rickyngk Similar but it cannot be solved by setting GL_PERSPECTIVE_CORRECTION_HINT as GL_NICEST. As you know, homogenous 3d coordinates consist of 4 values: x, y, z, w. Here, w is set to 1 internally and to get a perspective effect, it should be set any other value then 1.

@techdojo exactly

@Rickyngk I think we can use. Just modifying EAGLView should be enough.