Help adding procedurally generated mesh code into a project

anonymous_user_86d41c48 · March 28, 2015, 11:02pm

Hi all, so I was told about this:

github page which has code to give your procedurally generated mesh collision.
I have no idea what to do or where to start. I’ve already made a .cpp and .h file which are customMesh classes called

GenertatedMeshComponent

My project is called

TriKakei

when I try to copy the respective .cpp and .h files found on the github page, into my .h and .cpp files I get tons of errors. What am I suppose to rename/ include/replace etc.?
Please forgive my lack of knowledge, I have absolutely no knowledge of C++ coding with UE4.

EDIT WITH MORE INFORMATION:

I know the basics of coding, not much about C++, since blueprints have been doing it for me fine until now.

The github link has both the .proceduralmeshcomponent.cpp and .proceduralmeshcomponent.h.

If you click ‘view’ in the top right of each you get to these two pages:

github.com

SRombauts/UE4ProceduralMesh/blob/728cd931d2f0bde7359168ffcc863bfbbaa8c718/Source/ProceduralMesh/ProceduralMeshComponent.cpp

// UE4 Procedural Mesh Generation from the Epic Wiki (https://wiki.unrealengine.com/Procedural_Mesh_Generation)
//
// forked from "Engine/Plugins/Runtime/CustomMeshComponent/Source/CustomMeshComponent/Private/CustomMeshComponent.cpp"

#include "ProceduralMesh.h"
#include "DynamicMeshBuilder.h"
#include "ProceduralMeshComponent.h"
#include "Runtime/Launch/Resources/Version.h"

/** Vertex Buffer */
class FProceduralMeshVertexBuffer : public FVertexBuffer
{
public:
	TArray<FDynamicMeshVertex> Vertices;

	virtual void InitRHI() override
	{
		FRHIResourceCreateInfo CreateInfo;
		VertexBufferRHI = RHICreateVertexBuffer(Vertices.Num() * sizeof(FDynamicMeshVertex), BUF_Static, CreateInfo);
		// Copy the vertex data into the vertex buffer.

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github.com

SRombauts/UE4ProceduralMesh/blob/728cd931d2f0bde7359168ffcc863bfbbaa8c718/Source/ProceduralMesh/ProceduralMeshComponent.h

// UE4 Procedural Mesh Generation from the Epic Wiki (https://wiki.unrealengine.com/Procedural_Mesh_Generation)
//
// forked from "Engine/Plugins/Runtime/CustomMeshComponent/Source/CustomMeshComponent/Classes/CustomMeshComponent.h"

#pragma once

#include "ProceduralMeshComponent.generated.h"

USTRUCT(BlueprintType)
struct FProceduralMeshVertex
{
	GENERATED_USTRUCT_BODY()

	UPROPERTY(EditAnywhere, Category=Triangle)
	FVector Position;

	UPROPERTY(EditAnywhere, Category=Triangle)
	FColor Color;

	UPROPERTY(EditAnywhere, Category=Triangle)

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(That’s the .h and .cpp I’m directly copying)

After doing Test>Debug>All tests I get a these errors:

Maybe I’m suppose to rename some stuff and delete it? Not sure…

Azarus · March 28, 2015, 11:15pm

What errors do you get exactly? Which code are you copying?
Also if you don’t know c++ it is never too late to learn the basics at least

anonymous_user_86d41c48 · March 28, 2015, 11:23pm

Updated the main post with more info.

Azarus · March 28, 2015, 11:44pm

First of all you can forget about the Error List tab it is used by intel sense which is completely messed up thanks fully to the precompiler headers. =(

Go look at the Output tab if you need errors and warning messages.

You only need these files:

ProceduralMeshComponent.h
ProceduralMeshComponent.cpp

Secondly:

Replace all occurrence of

#include "ProceduralMesh.h"

to

#include "TriKakei.h"

Also find your TriKakei.Build.cs file and make sure it looks like something this:

using UnrealBuildTool;

public class TriKakei : ModuleRules
{
	public TriKakei(TargetInfo Target)
	{
        PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore" });
        PublicDependencyModuleNames.AddRange(new string[] { "RHI", "RenderCore", "ShaderCore" });

        PrivateDependencyModuleNames.AddRange(new string[] { });

	}
}

I think that’s all. Now you should be able to compile your code without errors
If not, let me know i update my post.

anonymous_user_86d41c48 · March 29, 2015, 12:13am

I don’t seem to have a

Proceduralmesh.h
At least when I ctrl + f I don’t find any. I have multiple
ProceduralMeshComponent
And other functions involving ProceduralMesh such as
ClearProceduralMeshTriangles(); OR SetProceduralMeshTeriangle($SomeArgs)

This is what my build.cs looks like:

Thanks for all your help so far! I’ve up voted your answer

EDIT: So I went to Test>Debug>All Tests again, and I got a pop-up saying:

There were build errors. Would you like to continue and run tests from the last successful build?

Clicking ‘no’ and looking at my output tab it says:

The operation was canceled
Clicking ‘yes’ brings me to an empty output tab. (I assume no errors)?

Azarus · March 29, 2015, 12:18am

You need only those 2 files if you plan to work with blueprints. The other files are just c++ usage examples.

anonymous_user_86d41c48 · March 29, 2015, 12:19am

Alright. I’ll test it out and get back to you/ mark your answer as correct if it works!

What would be the nodes I would use in blueprints to enable collision for this procedural mesh?

anonymous_user_86d41c48 · March 29, 2015, 12:26am

It seems I’m unable to create this file!

The github page says:

Basic blueprints are created from the C++ Procedural Actor classes. This help demonstrating how they can be spawned manually in the level at construction time

Also, when I type in ‘generatedMesh’ which is the class name, nothing appears :\

What else could I have done wrong?

Azarus · March 29, 2015, 12:30am

Create a new Actor and add the Procedural Mesh Component component to it

anonymous_user_86d41c48 · March 29, 2015, 12:36am

Procedural Mesh compoennt is not showing up.

If I click ‘new C++ Component’ and then I can choose generatedMeshComponent, but that I believe is with blueprints.

Azarus · March 29, 2015, 12:41am

here?

The assimp mesh is the same as the procedural mesh i just renamed it.

anonymous_user_86d41c48 · March 29, 2015, 12:42am

Alright. I got it. Thanks.

How would I go about just simply creating a triangle that has collision with this?

Azarus · March 29, 2015, 12:45am

Yes, Just create your triangles and the Set Procedural Mesh Triangles node will do the trick!

anonymous_user_86d41c48 · March 29, 2015, 12:47am

I don’t have a custom Set procedural mesh triangles only a custom mesh triangles.

Azarus · March 29, 2015, 1:06am

If you did everything right then you should have these new nodes avalaible:

anonymous_user_86d41c48 · March 29, 2015, 1:12am

I don’t seem to have it.
This is a link to my .cpp .h and .cs files:

You should be able to view them in-browser.

Azarus · March 29, 2015, 1:21am

Oh, well delete those 2 GeneratedMeshComponent files.

And download these 2 files:

ProceduralMeshComponent.cpp

https://raw.githubusercontent.com/SRombauts/UE4ProceduralMesh/master/Source/ProceduralMesh/ProceduralMeshComponent.cpp

ProceduralMeshComponent.h

https://raw.githubusercontent.com/SRombauts/UE4ProceduralMesh/master/Source/ProceduralMesh/ProceduralMeshComponent.h

Copy them into your Sources folder.

Go to your .uproject file right click and select Generate Visual Studio Project files. (It will update the solution file with the new source files)

Replace the

#include "ProceduralMesh.h"

Inside your ProceduralMeshComponent.cpp file.

anonymous_user_86d41c48 · March 29, 2015, 1:36am

To generate the .cpp and .h
files I made a new which is a ‘custommeshcomponent’

I then erased and replaced all the code with what you gave me.

The files were put in Source > Trikakei instead of just source.

It still does not appear though. Thanks so much for your help so far!!!

It is very much appreciated.

Azarus · March 29, 2015, 1:40am

It is not Custom Mesh. It is Procedural Mesh Component:

anonymous_user_86d41c48 · March 29, 2015, 1:53am

When I’m choosing a parent class which’ll generate the .cpp and .h files, which one should I choose?