3D-text | 3D text using LessCSS , Lettering.js , and CSS3 text-shadows | Data Manipulation library

TL;DR: I've activated and bound textures to textureunits 1-4 and now I wish to use them within shaders without using a program specific uniform position. Is it possible to read data from textures using the "global" texture units?

I'm having a bit of a hard time understanding how to access textures in webgl. Here in this tutorial on textures it says "Texture units are a global array of references to textures.", and this sounds great. I've bound my textures using

I am trying to map a texture at a cube, but I came across two problems and one question

here is the code for initialize the cube

3D Physics simulation needs access to neighbor vertices' positions and attributes in shader to calculate a vertex's new position. 2D version works but am having trouble porting solution to 3D. Flip-Flopping two 3D textures seems right, inputting sets of x,y and z coordinates for one texture, and getting vec4s which contains position-velocity-acceleration data of neighboring points to use to calculate new positions and velocities for each vertex. The 2D version uses 1 draw call with a framebuffer to save all the generated gl_FragColors to a sampler2D. I want to use a framebuffer to do the same with a sampler3D. But it looks like using a framebuffer in 3D, I need to write one+ layer at a time of a 2nd 3D texture, until all layers have been saved. I'm confused about mapping vertex grid to relative x,y,z coordinates of texture and how to save this to layers individually. In 2D version the gl_FragColor written to the framebuffer maps directly to the 2D x-y coordinate system of the canvas, with each pixel being a vertex. but I'm not understanding how to make sure the gl_FragColor which contains position-velocity data for a 3D vertex is written to the texture such that it keeps mapping correctly to the 3D vertices.

This works for 2D in a fragment shader:

I am using com.jogamp.opengl.GL2 to render a 3d-texture of shorts offscreen then resolve the results through glReadPixels. When my 3d-texture values are all positive, the results are what I expect. But when I have negative values I cannot figure out how to configure opengl to give correct results. I have tried glPixelStorei(GL2.GL_PACK_SWAP_BYTES, 1); and glPixelStorei(GL2.GL_UNPACK_SWAP_BYTES, 1);. I have tried all 4 combinations of GL_PACK/UNPACK_SWAP_BYTES and all results are incorrect.

The data spans from -1024 to +1024 (or around that range), so as an alternative, I normalize and denormalize after (+4096 then -4096 for good measure). That gives me the correct results, but it feels really hacky. Is there a correct way to render and resolve signed 16-bit through java?

Here is the basic code:

Im currently in the process of writing a Voxel Cone Tracing Rendering Engine with C++ and OpenGL. Everything is going rather fine, except that I'm getting rather strange results for wider cone angles.

Right now, for the purposes of testing, all I am doing is shoot out one singular cone perpendicularly to the fragment normal. I am only calculating 'indirect light'. For reference, here is the rather simple Fragment Shader I'm using:

i am trying to load up a single texture on a triangle in webgl. here is my code. I get no error but 2 warnings & i am unable to find out the reason for it, The warnings are :