Blacksmith3d texture painting across geometry

#BLACKSMITH3D TEXTURE PAINTING ACROSS GEOMETRY UPDATE#

The geometry should be tesselated enough to allow smooth interaction and prevent artifacts to appear. You can also change the geometry of the object your texture is mapped on. Keep in mind that not all pixel formats can be rendered to. GlDeleteFramebuffers( 1, &FFrameBuffer ) Your rendering code goes here - it will draw directly into the texture GlViewport( 0, 0, YourTextureWidth, YourTextureHeight )

GlFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, YourTextureID, 0 ) GlBindFramebuffer( GL_FRAMEBUFFER, FFrameBuffer )

implement render-to-texture with FBOs and shaders - it will requireДЇar more work to rewrite your code, but will give even betterДЇor FBOs the code can look like this: // setup FBO.

replace glTexImage2D() with glTexSubImage2D() - if you gain enough performance that's it, just let it be.

You say that you want it to work with OpenGL ES, so I would propose to do the following steps:

#BLACKSMITH3D TEXTURE PAINTING ACROSS GEOMETRY UPDATE#

On the other side, glTexSubImage2D allows to update only parts of the texture.

glTexSubImage2D is usually much faster since it only updates pixel inside the existing texture, while glTexImage2D creates entirely new texture (as a benefit you can change the size and pixel format of the texture). On unextended OpenGL you can change the pixels in system memory and then update texture with glTexImage2D/glTexSubImage2D - but this is inefficient last resort solution and should be avoided if possible. On desktop OpenGL you can use pixel buffer objects ( PBOs) to manipulate pixel data directly on GPU (but OpenGL ES does not support this yet). The most effective technique to change the pixels in the texture is called Render-to-Texture and can be done in OpenGL/OpenGL ES via FBOs. Update pixels (i assume this is what you mean in the question) There are at least two fundamentally different approaches:ДЎ.

Blacksmith3d texture painting across geometry