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Rendering block outlines of hidden blocks.


Jontom Xire

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One of the X-Ray mods renders an outline of certain blocks, even when they are hidden. I want to be able to do the same, but restricted by range.

 

I have been searching the reverse engineered documentation, but still have next to no idea how to achieve this. My best guess so far is to subscribe to the RenderLevelStageEvent event and then iterate through all blocks within range, test if they need to be outlined/highlighted, and then....stuff them into the OutlineBufferSource to be rendered some how?

 

I am not asking for code (although that would be nice) but just a few hints of the basic process.

 

Many thanks.

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6 hours ago, Jontom Xire said:

I have been searching the reverse engineered documentation, but still have next to no idea how to achieve this. My best guess so far is to subscribe to the RenderLevelStageEvent event and then iterate through all blocks within range, test if they need to be outlined/highlighted, and then....stuff them into the OutlineBufferSource to be rendered some how?

More or less. It would be better if you could store all the blocks you want to outline once so that you can just loop through that list. You may also want to take a look at the GameRenderer to see how block outlining is done when the player hovers over it and just modify the depth test.

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Thanks.

 

Where do I find the source code for the GameRenderer, or do you just mean look at the APIs available?

RenderLevelStageEvent gives me a LevelRenderer which has a renderLineBox() function. I am going to have a go with that but am not sure if the line box will be rendered in front even though the vertex positions are behind other blocks.

 

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Here is my code. It is late, I am tired, I have worked hard to get something sensible to compile in the face of significantly incomplete documentation, and it doesn't work. I would be so very very grateful if someone could help me work out why this isn't working.


    @SubscribeEvent
    public static void onViewBlocks(RenderLevelStageEvent event)
    {
        Minecraft  minecraft = Minecraft.getInstance();
        Player     player    = (Player)(minecraft.player);
        if (RenderLevelStageEvent.Stage.AFTER_SOLID_BLOCKS == event.getStage())
        {
            ClientLevel         level           = minecraft.level;
            LevelRenderer       renderer        = event.getLevelRenderer();
            OutlineBufferSource buffer_source   = minecraft.renderBuffers().outlineBufferSource();
            VertexConsumer      vertex_consumer = buffer_source.getBuffer(RenderType.lines());

            // Highlight all blocks within 4 blocks range.
            int                 min_x           = player.getBlockX() - 4;
            int                 max_x           = player.getBlockX() + 4;
            int                 min_y           = player.getBlockY() - 4;
            int                 max_y           = player.getBlockY() + 4;
            int                 min_z           = player.getBlockZ() - 4;
            int                 max_z           = player.getBlockZ() + 4;

            for (int x = min_x; x < max_x; x++)
            {
                for (int y = min_y; y < max_y; y++)
                {
                    for (int z = min_z; z < max_z; z++)
                    {
                         BlockPos block = new BlockPos(x, y, z)
                         Vec3 centre = block.getCenter();

                         if (centre.distanceToSqr(player.getEyePosition()) <= m_range_squared)
                         {
                             int ore = getOre(level.getBlockState(block).getBlock());  // Check that the block is an ore we want to highlight.

                             if (-1 < ore) {

                                         // If I put debug in here, it successfully reports the block as to be highlighted.

                                         renderer.renderLineBox(vertex_consumer,
                                                                (centre.x - 0.5),
                                                                (centre.y - 0.5),
                                                                (centre.z - 0.5),
                                                                (centre.x + 0.5),
                                                                (centre.y + 0.5),
                                                                (centre.z + 0.5),
                                                                ORE_COLOURS[ore].r,
                                                                ORE_COLOURS[ore].g,
                                                                ORE_COLOURS[ore].b,
                                                                0.5f);         // Not sure if 0.0 is solid colour or transparent. I'm tired. Forgive me!
                             }
                    }
                }
            }
        }
    }

 

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21 hours ago, Jontom Xire said:

I have worked hard to get something sensible to compile in the face of significantly incomplete documentation, and it doesn't work.

Less incomplete documentation, and more nobody in the community has wanted to document this. Makes sense if you think about how complicated it is.

21 hours ago, Jontom Xire said:

I would be so very very grateful if someone could help me work out why this isn't working.

From what I can gather, your position is most likely wrong. You need to subtract the camera location from the position such that it properly appears in the space. As for the transparency, 1 is opaque, 0 is transparent.

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On 2/6/2023 at 3:24 PM, ChampionAsh5357 said:

From what I can gather, your position is most likely wrong. You need to subtract the camera location from the position such that it properly appears in the space.

Like this?

    centre = centre - player.getEyePosition();

Do I not also need to apply camera view angle rotation or anything? I was hoping that the level renderer would apply all necessary scaling, translation, and rotation.

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1 hour ago, Jontom Xire said:

    centre = centre - player.getEyePosition();

No, the camera location. You have access to the camera from the GameRenderer to which you can then grab the position via #getPosition to subtract from the position you want the lines to render.

1 hour ago, Jontom Xire said:

Do I not also need to apply camera view angle rotation or anything? I was hoping that the level renderer would apply all necessary scaling, translation, and rotation.

Those should already be applied for you within the matrix stack. The only thing not transformed in most cases is the translation and that's typically when rendering on screen.

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up to 2147483648 bytes (2048 MiB)       CPUs: 16       Processor Vendor: GenuineIntel       Processor Name: 11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz       Identifier: Intel64 Family 6 Model 141 Stepping 1       Microarchitecture: unknown       Frequency (GHz): 2.30       Number of physical packages: 1       Number of physical CPUs: 8       Number of logical CPUs: 16       Graphics card #0 name: Intel(R) UHD Graphics       Graphics card #0 vendor: Intel Corporation (0x8086)       Graphics card #0 VRAM (MB): 1024.00       Graphics card #0 deviceId: 0x9a60       Graphics card #0 versionInfo: DriverVersion=31.0.101.1999       Graphics card #1 name: NVIDIA GeForce RTX 3060 Laptop GPU       Graphics card #1 vendor: NVIDIA (0x10de)       Graphics card #1 VRAM (MB): 4095.00       Graphics card #1 deviceId: 0x2560       Graphics card #1 versionInfo: DriverVersion=31.0.15.2892       Memory slot #0 capacity (MB): 8192.00       Memory slot #0 clockSpeed (GHz): 3.20       Memory slot #0 type: DDR4       Memory slot #1 capacity (MB): 8192.00       Memory slot #1 clockSpeed (GHz): 3.20       Memory slot #1 type: DDR4       Virtual memory max (MB): 27943.30       Virtual memory used (MB): 14154.98       Swap memory total (MB): 11776.00       Swap memory used (MB): 90.13       JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M       Launched Version: 1.20.4-forge-49.0.30       Launcher name: minecraft-launcher       Backend library: LWJGL version 3.3.2+13       Backend API: Intel(R) UHD Graphics GL version 4.6.0 - Build 31.0.101.1999, Intel       Window size: 854x480       GL Caps: Using framebuffer using OpenGL 3.2       GL debug messages:       Using VBOs: Yes       Is Modded: Definitely; Client brand changed to 'forge'       Universe: 400921fb54442d18       Type: Client (map_client.txt)       Graphics mode: fast       Render Distance: 12/12 chunks       Resource Packs:       Current Language: en_us       Locale: en_US       CPU: 16x 11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz       ModLauncher: 10.1.2       ModLauncher launch target: forge_client       ModLauncher naming: srg       ModLauncher services:             / slf4jfixer PLUGINSERVICE             / runtimedistcleaner PLUGINSERVICE             / runtime_enum_extender PLUGINSERVICE             / object_holder_definalize PLUGINSERVICE             / capability_token_subclass PLUGINSERVICE             / accesstransformer PLUGINSERVICE             / eventbus PLUGINSERVICE             / mixin PLUGINSERVICE             / fml TRANSFORMATIONSERVICE             / mixin TRANSFORMATIONSERVICE       FML Language Providers:             minecraft@1.0             lowcodefml@49             javafml@49.0.30       Mod List:             forge-1.20.4-49.0.30-client.jar                   |Minecraft                     |minecraft                     |1.20.4              |COMMON_SET|Manifest: NOSIGNATURE             forge-1.20.4-49.0.30-universal.jar                |Forge                         |forge                         |49.0.30             |COMMON_SET|Manifest: NOSIGNATURE       Crash Report UUID: 5380853b-d030-466a-8c5e-5c81ce00053c       FML: 0.0       Forge: net.minecraftforge:49.0.30
    • I am new at modding and i am in forge My question was how do i modify an already existing block property, like for blocks that you create its easy: public static final RegistryObject<Block> BURNEDWOOD = registerBlock("burnedwood", () -> new Block(BlockBehaviour.Properties.of().blablablabla)); but what do I put in for just vanilla blocks(I want to change the oak log to take more time to cut down, but idk how to access the properties of said block)
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