Created CustomObjectRenderer to allow for BufferedImages to be rendered at a given Position. This supports Zoom and Rotation on all 3 axes.

src/main/java/eu/crushedpixel/replaymod/renderer/CustomObjectRenderer.java

@@ -0,0 +1,112 @@
+package eu.crushedpixel.replaymod.renderer;
+
+import eu.crushedpixel.replaymod.holders.CustomImageObject;
+import eu.crushedpixel.replaymod.holders.ExtendedPosition;
+import eu.crushedpixel.replaymod.replay.ReplayHandler;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.client.renderer.WorldRenderer;
+import net.minecraft.entity.Entity;
+import net.minecraftforge.client.event.RenderWorldLastEvent;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
+import org.lwjgl.opengl.GL11;
+
+/**
+ * Allows users to render custom images in the World.
+ */
+public class CustomObjectRenderer {
+
+    private static final Minecraft mc = Minecraft.getMinecraft();
+
+    @SubscribeEvent
+    public void renderCustomObjects(RenderWorldLastEvent event) {
+        if(!ReplayHandler.isInReplay()) return;
+
+        Entity entity = ReplayHandler.getCameraEntity();
+        if(entity == null) return;
+
+        double doubleX = entity.posX;
+        double doubleY = entity.posY;
+        double doubleZ = entity.posZ;
+
+        GlStateManager.pushAttrib();
+        GlStateManager.pushMatrix();
+
+        GlStateManager.disableLighting();
+        GlStateManager.enableBlend();
+
+        GlStateManager.disableTexture2D();
+
+        //do stuff here
+        for(CustomImageObject object : ReplayHandler.getCustomImageObjects()) {
+            drawCustomImageObject(doubleX, doubleY, doubleZ, object);
+        }
+
+        GlStateManager.enableTexture2D();
+        GlStateManager.enableLighting();
+
+        GlStateManager.disableBlend();
+        GlStateManager.popAttrib();
+        GlStateManager.popMatrix();
+    }
+
+    private void drawCustomImageObject(double playerX, double playerY, double playerZ, CustomImageObject customImageObject) {
+        GlStateManager.pushMatrix();
+        GlStateManager.enableTexture2D();
+        GlStateManager.enableLighting();
+        GlStateManager.disableLighting();
+        GlStateManager.enableAlpha();
+
+        GlStateManager.disableBlend();
+
+        Tessellator tessellator = Tessellator.getInstance();
+        WorldRenderer renderer = tessellator.getWorldRenderer();
+
+        mc.renderEngine.bindTexture(customImageObject.getResourceLocation());
+
+        ExtendedPosition objectPosition = customImageObject.getPosition();
+
+        double x = objectPosition.getX() - playerX;
+        double y = objectPosition.getY() - playerY;
+        double z = objectPosition.getZ() - playerZ;
+
+        GL11.glNormal3f(0, 1, 0);
+
+        GlStateManager.translate(x, y + 1.4, z);
+
+        GlStateManager.rotate(-objectPosition.getYaw(), 0, 1, 0);
+        GlStateManager.rotate(objectPosition.getRoll(), 0, 0, 1);
+        GlStateManager.rotate(objectPosition.getPitch(), 1, 0, 0);
+
+        renderer.setColorRGBA_F(1, 1, 1, 0.5f);
+
+        float width = objectPosition.getWidth() * objectPosition.getScale();
+        float height = objectPosition.getHeight() * objectPosition.getScale();
+
+        float minX = -width/2 + objectPosition.getAnchorX();
+        float maxX = width/2 + objectPosition.getAnchorX();
+        float minY = -height/2 + objectPosition.getAnchorY();
+        float maxY = height/2 + objectPosition.getAnchorY();
+
+        renderer.startDrawingQuads();
+
+        renderer.addVertexWithUV(minX, minY, 0, 1, 1);
+        renderer.addVertexWithUV(minX, maxY, 0, 1, 0);
+        renderer.addVertexWithUV(maxX, maxY, 0, 0, 0);
+        renderer.addVertexWithUV(maxX, minY, 0, 0, 1);
+
+        renderer.addVertexWithUV(maxX, maxY, 0, 0, 0);
+        renderer.addVertexWithUV(minX, maxY, 0, 1, 0);
+        renderer.addVertexWithUV(minX, minY, 0, 1, 1);
+        renderer.addVertexWithUV(maxX, minY, 0, 0, 1);
+
+        tessellator.draw();
+        renderer.setTranslation(0, 0, 0);
+
+        GlStateManager.disableAlpha();
+        GlStateManager.disableTexture2D();
+        GlStateManager.enableLighting();
+        GlStateManager.popMatrix();
+    }
+}