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# 5. Calculate Euclidean Distance Transform # dt = Distance to nearest 0 (edge) dt = ndimage.distance_transform_edt(shape)
// Inside your fragment shader float distance = texture(sdfTexture, uv).r; float finalAlpha = smoothstep(0.5 - 0.05, 0.5 + 0.05, distance); gl_FragColor = vec4(1.0, 1.0, 1.0, finalAlpha); Because you are reading a distance rather than a color , you can zoom in 10,000% and the edge will remain mathematically perfect. Converting a PNG to an SDF transforms a static bitmap into a dynamic mathematical field. Whether you are rendering fonts in Unreal Engine, generating 3D meshes for simulation, or just trying to get a crisp icon on a WebGL canvas, the conversion is worth the five minutes it takes to set up.
# 6. Normalize SDF to 0-255 range for storage sdf_normalized = (dt / dt.max()) * 255 sdf_normalized = sdf_normalized.astype(np.uint8)
Enter the .
Standard SDFs struggle with sharp corners (like the tip of a star). If you need perfect vector quality, look into MSDF (Multi-channel SDF). Converting PNG to MSDF requires specialized tools like msdfgen . The Result: Perfect Scaling Once converted, you can render your SDF in a shader like this (GLSL snippet):
import cv2 import numpy as np from scipy import ndimage def png_to_sdf(input_path, output_path, radius=15): # 1. Load PNG as Grayscale img = cv2.imread(input_path, cv2.IMREAD_GRAYSCALE)
Is your shape black on white or white on black? SDFs care about sign . If your output looks like a bump instead of a cavity, invert the image before processing.
Raster images are great for humans looking at a screen. But for machines—especially those navigating a 3D space or rendering crisp fonts—they are notoriously inefficient.
# 5. Calculate Euclidean Distance Transform # dt = Distance to nearest 0 (edge) dt = ndimage.distance_transform_edt(shape)
// Inside your fragment shader float distance = texture(sdfTexture, uv).r; float finalAlpha = smoothstep(0.5 - 0.05, 0.5 + 0.05, distance); gl_FragColor = vec4(1.0, 1.0, 1.0, finalAlpha); Because you are reading a distance rather than a color , you can zoom in 10,000% and the edge will remain mathematically perfect. Converting a PNG to an SDF transforms a static bitmap into a dynamic mathematical field. Whether you are rendering fonts in Unreal Engine, generating 3D meshes for simulation, or just trying to get a crisp icon on a WebGL canvas, the conversion is worth the five minutes it takes to set up.
# 6. Normalize SDF to 0-255 range for storage sdf_normalized = (dt / dt.max()) * 255 sdf_normalized = sdf_normalized.astype(np.uint8)
Enter the .
Standard SDFs struggle with sharp corners (like the tip of a star). If you need perfect vector quality, look into MSDF (Multi-channel SDF). Converting PNG to MSDF requires specialized tools like msdfgen . The Result: Perfect Scaling Once converted, you can render your SDF in a shader like this (GLSL snippet):
import cv2 import numpy as np from scipy import ndimage def png_to_sdf(input_path, output_path, radius=15): # 1. Load PNG as Grayscale img = cv2.imread(input_path, cv2.IMREAD_GRAYSCALE)
Is your shape black on white or white on black? SDFs care about sign . If your output looks like a bump instead of a cavity, invert the image before processing.
Raster images are great for humans looking at a screen. But for machines—especially those navigating a 3D space or rendering crisp fonts—they are notoriously inefficient.
