1.19.3 How To Get View Matrix?

[sFXprt]

Hi, I am trying to get the View Matrix so I can draw stuff in the game such as ESP or block/item/entity glow. Issue is I cant find the correct View Matrix. I am able to find the Projection Matrix from 

Minecraft.getInstance().gameRenderer.getProjectionMatrix(Minecraft.getInstance().options.fov().get());

and it works but I cant find the View Matrix at all. I've looked through all the classes and methods and the closest thing I found was 

RenderSystem.getModelViewMatrix();
RenderSystem.getShader().MODEL_VIEW_MATRIX.getFloatBuffer()
Minecraft.getInstance().gameRenderer.blitShader.MODEL_VIEW_MATRIX.getFloatBuffer();
Minecraft.getInstance().gameRenderer.getShader("").MODEL_VIEW_MATRIX.getFloatBuffer(); // Anyone know what goes in the string argument??

which both causes the game to print the usual unexpected errors message when running the code. 

This is all my code does so far

Vector3f screen_pos = WorldToScreen(new Vector3f((float) entity.position().x(), (float) entity.position().y(), (float) entity.position().z()), view_matrix, height, width);

Utils.MessageEx(p, "Screen X: " + screen_pos.x() + " Screen Y: " + screen_pos.y(), false);

All it does is return "An unexpected error has occurred" in the chat and I can't trace the exception error since its not stored in the logs unless a crash occurs(please let me know how to trace exceptions without crash)

So I'm just assuming I'm getting uninitialized matrix data which results in some null exception or something. 

 

EDIT:

I think I may have found it, calling 

Matrix4f m = new PoseStack().last().pose();

returns valid numbers in after World To Screen is called. Before I start rendering can anyone confirm this is indeed the most up to date View Matrix? And is there an interface forge uses to render objects. I know it dabbles in OpenGL but I am very unfamiliar with it and I was hoping it had built in rendering to combat open use of GL

Edited April 3, 2023 by sFXprt

[warjort]

When you draw things in minecraft you do it in "world co-ordinates" not screen co-ordinates.

Minecraft will later translate the finish image into screen co-ordinates.

 

In a lot of cases you use "relative world co-ordinates"

i.e. minecraft calls your rendering code with the PoseStack already translated to the block/entity co-ordinates.

So you can just draw as though the block or entity was at 0, 0, 0

 

There are some specialist cases where you need to draw relative to the camera position (drawing custom block outlines is one IIRC?). But these are the exceptions.

In those cases forge passes you the data you need: https://github.com/MinecraftForge/MinecraftForge/blob/b5655b0ddc93ee0c02c9ad1b3a9a4dbd9bd3c572/src/main/java/net/minecraftforge/client/event/RenderHighlightEvent.java#L60

[sFXprt]

@warjort Thanks for helping me understand things better, so where do I go from now say for instance I want to draw an Rectangular Box around an Entity. Would I go about this using the RenderSystem class? If so could I get a simple example? I tried following Wurst Client source code which led me to seeing RenderSystem, VertexBuffer, and something called a MatrixStack being used? Which was called to get the View Matrix 

Matrix4f viewMatrix = matrixStack.peek().getPositionMatrix();

https://github.com/Wurst-Imperium/Wurst7/blob/master/src/main/java/net/wurstclient/hacks/chestesp/ChestEspRenderer.java#:~:text=Matrix4f viewMatrix %3D matrixStack.peek().getPositionMatrix()%3B

Edited April 3, 2023 by sFXprt

[warjort]

You use EntityRenderers/Layers.

Registration: https://github.com/MinecraftForge/MinecraftForge/blob/1.19.x/src/main/java/net/minecraftforge/client/event/EntityRenderersEvent.java#L52

For examples, look at vanilla code or other mods. Most use entity models rather than direct rendering.

 

Things like Wurst (hacks) are not supported in this forum.

[sFXprt]

@warjort thank you for your response, I can now access any given entitys renderer instance so how would I go about drawing it? Only example that comes to my mind is the glowing effect. Which I've tried to find its functionality through vanilla code to no avail. Best I found was it referring to a glowing.png file which upon opening the picture it displayed a skeleton head with white squares surrounding it.

EDIT: I've found this other forge topic which is exactly what I'm trying to achieve - 

However it runs on different code, specifically I cant find setTranslation() and RenderGlobal doesn't exist(maybe its RenderSystem now?) 

Edited April 4, 2023 by sFXprt