Prerequisites

<dependency>
  <groupId>org.aspose.slides.foss</groupId>
  <artifactId>aspose-slides-foss</artifactId>
  <version>1.0.0</version>
</dependency>

Add an Outer Drop Shadow

import org.aspose.slides.foss.*;

try (Presentation prs = new Presentation()) {
    IAutoShape shape = prs.getSlides().get(0).getShapes().addAutoShape(
        ShapeType.RECTANGLE, 100, 100, 300, 120
    );
    shape.addTextFrame("Shadowed Shape");

    IEffectFormat ef = shape.getEffectFormat();
    ef.enableOuterShadowEffect();
    ef.getOuterShadowEffect().setBlurRadius(10);       // softness in points
    ef.getOuterShadowEffect().setDirection(315);       // 315 degrees = upper-left
    ef.getOuterShadowEffect().setDistance(8);           // offset in points
    ef.getOuterShadowEffect().getShadowColor().setColor(
        Color.fromArgb(128, 0, 0, 0)
    );

    prs.save("shadow.pptx", SaveFormat.PPTX);
}

Common direction values: 0=right, 45=lower-right, 90=down, 180=left, 270=up, 315=upper-left.

Add a Glow Effect

import org.aspose.slides.foss.*;

try (Presentation prs = new Presentation()) {
    IAutoShape shape = prs.getSlides().get(0).getShapes().addAutoShape(
        ShapeType.ELLIPSE, 150, 100, 250, 250
    );

    IEffectFormat ef = shape.getEffectFormat();
    ef.enableGlowEffect();
    ef.getGlowEffect().setRadius(20);
    ef.getGlowEffect().getColor().setColor(
        Color.fromArgb(255, 255, 215, 0)   // gold
    );

    prs.save("glow.pptx", SaveFormat.PPTX);
}

Apply a Gaussian Blur

import org.aspose.slides.foss.*;

try (Presentation prs = new Presentation()) {
    IAutoShape shape = prs.getSlides().get(0).getShapes().addAutoShape(
        ShapeType.RECTANGLE, 100, 100, 350, 180
    );
    shape.getEffectFormat().setBlurEffect(10, true);

    prs.save("blur.pptx", SaveFormat.PPTX);
}

grow=true expands the blur region beyond the shape boundary; grow=false clips the blur inside the shape.

Apply a 3D Bevel

import org.aspose.slides.foss.*;

try (Presentation prs = new Presentation()) {
    IAutoShape shape = prs.getSlides().get(0).getShapes().addAutoShape(
        ShapeType.RECTANGLE, 150, 150, 280, 120
    );
    shape.addTextFrame("3D Button");

    IThreeDFormat tdf = shape.getThreeDFormat();
    tdf.getBevelTop().setBevelType(BevelPresetType.CIRCLE);
    tdf.getBevelTop().setWidth(12);
    tdf.getBevelTop().setHeight(6);

    prs.save("bevel.pptx", SaveFormat.PPTX);
}

BevelPresetType values: CIRCLE, RELAXED_INSET, COOL_SLANT, DIVOT, RIBLET, HARD_EDGE, SLOPE, CONVEX

3D Bevel with Camera and Light Rig

import org.aspose.slides.foss.*;

try (Presentation prs = new Presentation()) {
    IAutoShape shape = prs.getSlides().get(0).getShapes().addAutoShape(
        ShapeType.RECTANGLE, 150, 150, 280, 120
    );
    shape.addTextFrame("Metal Button");

    IThreeDFormat tdf = shape.getThreeDFormat();
    tdf.getBevelTop().setBevelType(BevelPresetType.CIRCLE);
    tdf.getBevelTop().setWidth(10);
    tdf.getBevelTop().setHeight(5);
    tdf.getCamera().setCameraType(CameraPresetType.PERSPECTIVE_ABOVE);
    tdf.getLightRig().setLightType(LightRigPresetType.BALANCED);
    tdf.getLightRig().setDirection(LightingDirection.TOP);
    tdf.setMaterial(MaterialPresetType.METAL);
    tdf.setDepth(20);

    prs.save("3d-metal.pptx", SaveFormat.PPTX);
}

Combine Shadow and 3D Bevel

Both effect systems can be active simultaneously on the same shape:

import org.aspose.slides.foss.*;

try (Presentation prs = new Presentation()) {
    IAutoShape shape = prs.getSlides().get(0).getShapes().addAutoShape(
        ShapeType.ROUND_CORNER_RECTANGLE, 150, 150, 320, 130
    );
    shape.addTextFrame("Premium Card");

    // Solid fill
    shape.getFillFormat().setFillType(FillType.SOLID);
    shape.getFillFormat().getSolidFillColor().setColor(
        Color.fromArgb(255, 30, 80, 180)
    );

    // 3D bevel
    IThreeDFormat tdf = shape.getThreeDFormat();
    tdf.getBevelTop().setBevelType(BevelPresetType.CIRCLE);
    tdf.getBevelTop().setWidth(8);
    tdf.getCamera().setCameraType(CameraPresetType.PERSPECTIVE_ABOVE);
    tdf.setMaterial(MaterialPresetType.PLASTIC);

    // Drop shadow
    IEffectFormat ef = shape.getEffectFormat();
    ef.enableOuterShadowEffect();
    ef.getOuterShadowEffect().setBlurRadius(12);
    ef.getOuterShadowEffect().setDirection(270);
    ef.getOuterShadowEffect().setDistance(6);
    ef.getOuterShadowEffect().getShadowColor().setColor(
        Color.fromArgb(80, 0, 0, 0)
    );

    prs.save("premium-card.pptx", SaveFormat.PPTX);
}

Check and Remove Effects

import org.aspose.slides.foss.*;

try (Presentation prs = new Presentation()) {
    IAutoShape shape = prs.getSlides().get(0).getShapes().addAutoShape(
        ShapeType.RECTANGLE, 100, 100, 200, 100
    );
    IEffectFormat ef = shape.getEffectFormat();

    ef.enableOuterShadowEffect();
    ef.enableGlowEffect();
    System.out.println("Has effects: " + !ef.isNoEffects());  // true

    ef.disableOuterShadowEffect();
    ef.disableGlowEffect();
    System.out.println("Has effects: " + !ef.isNoEffects());  // false
}

How to Apply 3D Effects and Shadows to Shapes